diff --git a/components/translator.js b/components/translator.js
index 75f7ccb..b63b030 100644
--- a/components/translator.js
+++ b/components/translator.js
@@ -5,6 +5,83 @@ const britishOnly = require('./british-only.js')
 
 class Translator {
 
+    translateAmerican(string) {
+
+        const americanOnlyKeys = Object.keys(americanOnly).sort((a, b) => b.length - a.length);
+        const americanToBritishSpellingKeys = Object.keys(americanToBritishSpelling).sort((a, b) => b.length - a.length);
+        const americanToBritishTitlesKeys = Object.keys(americanToBritishTitles).sort((a, b) => b.length - a.length);
+
+        americanOnlyKeys.forEach(key => {
+
+            const regex = new RegExp(key, 'i');
+
+            if (string.match(regex)) {
+
+                const replace = `<span class="highlight">${americanOnly[key]}</span>`;
+
+                string = string.replace(regex, replace);
+
+            }
+
+        });
+
+        americanToBritishSpellingKeys.forEach(key => {
+
+            const regex = new RegExp(key, 'i');
+
+            if (string.match(regex)) {
+
+                const replace = `<span class="highlight">${americanToBritishSpelling[key]}</span>`
+
+                string = string.replace(regex, replace);
+
+            }
+
+        });
+
+        americanToBritishTitlesKeys.forEach(key => {
+
+            const regex = new RegExp(key, 'i');
+
+            if (string.match(regex)) {
+
+                const value = americanToBritishTitles[key];
+
+                const firstLetter = value.slice(0,1).toUpperCase();
+                const rest = value.slice(1, value.length);
+
+                const title = firstLetter + rest;
+
+                const replace = `<span class="highlight">${title}</span>`;
+
+                string = string.replace(regex, replace);
+
+            }
+
+        });
+
+        const timeRegex = /\d+:\d{2}/;
+
+        if (string.match(timeRegex)) {
+
+            const time = string.match(timeRegex)[0].replace(':', '.');
+
+            const replace = `<span class="highlight">${time}</span>`;
+
+            string = string.replace(timeRegex, replace);
+
+        }
+
+        return string;
+
+    }
+
+    translateBritish(string) {
+
+        
+
+    }
+
 }
 
 module.exports = Translator;
\ No newline at end of file
diff --git a/tests/1_unit-tests.js b/tests/1_unit-tests.js
index aefa529..3b19a46 100644
--- a/tests/1_unit-tests.js
+++ b/tests/1_unit-tests.js
@@ -2,12 +2,256 @@ const chai = require('chai');
 const assert = chai.assert;
 
 const Translator = require('../components/translator.js');
+const translator = new Translator();
 
 suite('Unit Tests', () => {
 
     test('Translate { Mangoes are my favorite fruit. } to British English', done => {
         
-        assert.fail();
+        const string = 'Mangoes are my favorite fruit.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'Mangoes are my <span class="highlight">favourite</span> fruit.');
+        done();
+
+    });
+
+    test('Translate { I ate yogurt for breakfast. } to British English', done => {
+        
+        const string = 'I ate yogurt for breakfast.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'I ate <span class="highlight">yoghurt</span> for breakfast.');
+        done();
+
+    });
+
+    test('Translate { We had a party at my friend\'s condo. } to British English', done => {
+        
+        const string = 'We had a party at my friend\'s condo.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'We had a party at my friend\'s <span class="highlight">flat</span>.');
+        done();
+
+    });
+
+    test('Translate { Can you toss this in the trashcan for me? } to British English', done => {
+        
+        const string = 'Can you toss this in the trashcan for me?';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'Can you toss this in the <span class="highlight">bin</span> for me?');
+        done();
+
+    });
+
+    test('Translate { The parking lot was full. } to British English', done => {
+        
+        const string = 'The parking lot was full.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'The <span class="highlight">car park</span> was full.');
+        done();
+
+    });
+
+    test('Translate { Like a high tech Rube Goldberg machine. } to British English', done => {
+        
+        const string = 'Like a high tech Rube Goldberg machine.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'Like a high tech <span class="highlight">Heath Robinson device</span>.');
+        done();
+
+    });
+
+    test('Translate { To play hooky means to skip class or work. } to British English', done => {
+        
+        const string = 'To play hooky means to skip class or work.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'To <span class="highlight">bunk off</span> means to skip class or work.');
+        done();
+
+    });
+
+    test('Translate { No Mr. Bond, I expect you to die. } to British English', done => {
+        
+        const string = 'No Mr. Bond, I expect you to die.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'No <span class="highlight">Mr</span> Bond, I expect you to die.');
+        done();
+
+    });
+
+    test('Translate { Dr. Grosh will see you now. } to British English', done => {
+        
+        const string = 'Dr. Grosh will see you now.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, '<span class="highlight">Dr</span> Grosh will see you now.');
+        done();
+
+    });
+
+    test('Translate { Lunch is at 12:15 today. } to British English', done => {
+        
+        const string = 'Lunch is at 12:15 today.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'Lunch is at <span class="highlight">12.15</span> today.');
+        done();
+
+    });
+
+    test('Translate { We watched the footie match for a while. } to American English', done => {
+        
+        const string = 'We watched the footie match for a while.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'We watched <span class="highlight">soccer</span> match for a while.');
+        done();
+
+    });
+
+    test('Translate { Paracetamol takes up to an hour to work. } to American English', done => {
+        
+        const string = 'Paracetamol takes up to an hour to work.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, '<span class="highlight">Tylenol</span> takes up to an hour to work.');
+        done();
+
+    });
+
+    test('Translate { First, caramelise the onions. } to American English', done => {
+        
+        const string = 'First, caramelise the onions.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'First, <span class="highlight">caramelize</span> the onions.');
+        done();
+
+    });
+
+    test('Translate { I spent the bank holiday at the funfair. } to American English', done => {
+        
+        const string = 'I spent the bank holiday at the funfair.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'I spent the <span class="highlight">public holiday</span> at the <span class="highlight">carnival</span>.');
+        done();
+
+    });
+
+    test('Translate { I had a bicky then went to the chippy. } to American English', done => {
+        
+        const string = 'I had a bicky then went to the chippy.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'I had a <span class="highlight">cookie</span> then went to the <span class="highlight">fish-and-chip shop</span>.');
+        done();
+
+    });
+
+    test('Translate { I\'ve just got bits and bobs in my bum bag. } to American English', done => {
+        
+        const string = 'I\'ve just got bits and bobs in my bum bag.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'I\'ve just got <span class="highlight">odds and ends</span> in my <span class="highlight">fanny pack</span>.');
+        done();
+
+    });
+
+    test('Translate { The car boot sale at Boxted Airfield was called off. } to American English', done => {
+        
+        const string = 'The car boot sale at Boxted Airfield was called off.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'The <span class="highlight">swap meet</span> at Boxted Airfield was called off.');
+        done();
+
+    });
+
+    test('Translate { Have you met Mrs Kalyani? } to American English', done => {
+        
+        const string = 'Have you met Mrs Kalyani?';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'Have you met <span class="highlight">Mrs.</span> Kalyani?');
+        done();
+
+    });
+
+    test('Translate { Prof Joyner of King\'s College, London. } to American English', done => {
+        
+        const string = 'Prof Joyner of King\'s College, London.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, '<span class="highlight">Prof.</span> Joyner of King\'s College, London.');
+        done();
+
+    });
+
+    test('Translate { Tea time is usually around 4 or 4.30. } to American English', done => {
+        
+        const string = 'Tea time is usually around 4 or 4.30.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'Tea time is usually around 4 or <span class="highlight">4:30</span>.');
+        done();
+
+    });
+
+    test('Translate { Tea time is usually around 4 or 4.30. } to American English', done => {
+        
+        const string = 'Tea time is usually around 4 or 4.30.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'Tea time is usually around 4 or <span class="highlight">4:30</span>.');
+        done();
+
+    });
+
+    test('Highlight differences { Mangoes are my favorite fruit. } when translated to British English', done => {
+        
+        const string = 'Mangoes are my favorite fruit.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'Mangoes are my <span class="highlight">favourite</span> fruit.');
+        done();
+
+    });
+
+    test('Highlight differences { I ate yogurt for breakfast. } when translated to British English', done => {
+        
+        const string = 'I ate yogurt for breakfast.';
+        const result = translator.translateAmerican(string);
+
+        assert.equal(result, 'I ate <span class="highlight">yoghurt</span> for breakfast.');
+        done();
+
+    });
+
+    test('Highlight differences { We watched the footie match for a while. } when translated to American English', done => {
+        
+        const string = 'We watched the footie match for a while.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, 'We watched <span class="highlight">soccer</span> match for a while.');
+        done();
+
+    });
+
+    test('Highlight differences { Paracetamol takes up to an hour to work. } when translated to American English', done => {
+        
+        const string = 'Paracetamol takes up to an hour to work.';
+        const result = translator.translateBritish(string);
+
+        assert.equal(result, '<span class="highlight">Tylenol</span> takes up to an hour to work.');
         done();
 
     });