Here are a few more examples of British and American spellings of verbs: Past Simple/Past Participles The following verbs have two acceptable forms of the past simple/past participle in both American and British English, however, the irregular form is generally more common in British English (the first form of the two) and the regular form is more common to American English. • Dream dreamt OR dreamed • Lean leant OR leaned • Learn learnt OR learned • Smell smelt OR smelled • Spell spelt OR spelled • Spill spilt OR spilled •Spoil spoilt OR spoiled

Learnt is not a word so in that case you always use learned. Burnt is an adjective and burned is a verb. I can't think of any other words right now, but if you think of some just let me know.

Yes, there are several verbs and nouns that have different spellings, but mean the same thing. The differences are between British spelling and American spelling. The British spelling is the original spelling, but many of the changes made by the Americans seem to make better phonetical (the sound when pronounced) sense. Here is a great Oxford website that explains, in simple terms, the differences between the two systems of spelling: http://oxforddictionaries.com/page/spellingbritamericanspell/british-and-american-spelling

"Learned" and ''learnt" are both past participles of "to learn." In the US we almost always use "learned." I think ''learnt" might be common British usage. They are both interchangeable. As to the verb "to burn," "burned" and ''burnt are both past participles of that verb. In my part of the country I have always heard "burned" used as the past tense of the verb and ''burnt" used as an adjective.

When using burned, it applies that (Someone) or (Something) has done the action of "Burning". When using burnt, it simply means that (Something) or (Someone) is burnt To simplify, He burned his arm or We burned the planks to start a fire The sentences consist of a Subject, Object and Verb. But to use burnt, it would only need a Subject and Verb For example The toast is burnt My skin is burnt from the sun If you still are confused, I can explain more briefly. This can also be applied to learned or learnt, and any verb similar. Though Learnt and Burnt don't register to the English language, it's moreover a slang word.