More articles
A / An (Indefinite Article)
A1
Use 'a' or 'an' before singular countable nouns when you mention something for the first time or talk about it in a general, non-specific way. Use 'a' before a consonant sound and 'an' before a vowel sound.
The (Definite Article)
A2
Use 'the' when it is clear which specific thing you mean — because it was already mentioned, is unique, or is known from the situation.
Zero Article (No Article)
A2
Use no article with plural and uncountable nouns when talking generally, and with most names of people, countries, meals, languages, and abstract ideas.
A Few and A Little
A2
'A few' means a small but positive amount with countable nouns; 'a little' does the same for uncountable nouns. Without 'a', 'few' and 'little' sound more negative.
All, Every, Each
B1
'All' refers to a whole group together; 'every' and 'each' look at members one by one. 'Every' takes a singular noun and a singular verb, as does 'each'.
Both, Either, Neither
B1
These words talk about two things. 'Both' means the two together, 'either' means one or the other, and 'neither' means not one and not the other.