inglese - both either neither

inglese - both either neither

both means one and another. It takes a plural verb

both banks of the river were covered in bushes
She has two sons. Both are taller then she is.

neither means not one and not another. it takes  an affimative singular verb

neither of them drinks coffe

either means any one of two 

Did you like his two songs? No  I didn't like either (of them)

neither + affirmative verb = either + negative verb

neither is preferred at the beginning of a sentence

Neither book give the answer

either could not be used here.

neither can also be used alone as a negative answer to a question

which did you buy ? neither

either would not be used.

Pronouns and possessive adjectives with neither either (used of people)

As they take singular verbs  the pronouns should be  he/him and she /her  and the possessive adjectives should be his and her. But in colloquial English there is  growing tendency to use they /them and their

Neither of them could make up his mind (formal English)
Niether of them make us their minds (colloquial)
Neither of them knew the way di they ? (colloquial)