You use 'an' before words with 'a', 'e', 'i', 'o', 'u' or 'h' E.g. This was an absolutely exceptional day, an historic day for an extraordinary people, an unbelievable occurrence from an incredibly exceptional person. A comes before all consonants except 'h'. E.g. A truly beautiful woman, a very impressive young student, a wonderful person etc. Uncountable & singular nouns: Uncountable nouns (abstract, nouns without plural conjugations) are always singular - "Please, help yourself to some of the food", "The intelligence of this student is amazing", "you must look after the equipment at all times", "look at all of the water in the room", "My mum likes to cook with a lot of peanut butter". Countable nouns will always have quantitative properties, where you can specifically define how many units of the noun that you saw, for example - "There are twenty students in the classroom", "I see 12 cans of tuna in the pantry", "I saw 15 kangaroos today!" Hope this helps, there's a great webpage here explaining it for you :) http://www.gingersoftware.com/content/grammar-rules/nouns/countable-uncountable-nouns/ Nick

"The" can be used with singular, plural, and uncountable objects. It refers to an object that is previously mentioned or obvious. For example, "I see a cookie. Did you want the cookie?" "The" refers to the cookie already mentioned. If you hadn't already mentioned the cookie, using "the" would make the reader wonder what cookie you're referencing. Was it mentioned and the reader just missed it? On the other hand, "I have looked everywhere under the sun." Since we only have one sun, "the" is used since we're obviously talking about that sun, not some other sun. "A/an" is only used when introducing a new object and it is singular. I do have a good lesson on this... Why not book a trial lesson and we'll talk about it?