Hi Laterne, Use "a" if you're not definite as to which thing you are talking about. Eg, "a dog" (not definite which dog, could be any dog, an example dog or a dog you don't know) Use "the" if you know exactly which thing you are talking about. Eg, "the dog" (you've already mentioned the dog, or whoever you speak to knows which dog it is)

'a/an' is just for things in general, if you're not talking about a specific thing, e.g. "I want AN apple" you're not after one particular apple, you just want one. 'the' is for a specific thing. If you said "I want THE apple" then you're after one particular apple instead of just an apple in general.