All/Both/Neither/None/Either & Double conjunctions

All/Both/Neither/None/Either

-- All is used for more than two people or things. It is used in affirmative sentences and takes a plural verb.

-- Both is used for two people, things, etc. It is used in affirmative sentences and takes a plural verb.

-- Neither is used for two people, things, etc. It is used in affirmative sentences and gives them a negative meaning. It takes a singular or plural verb.

-- None is used for more than two people, things, etc. It is used in affirmative sentences and gives them a negative meaning. It takes a singular or plural verb.

-- Either is used for two people, things, etc. It means one or the other (it doesn't matter which of the two)

Double conjunctions

Double conjunctions link two words or phrases in the same sentences.

-- Both... and... Is used when something is true for two people, things, etc. It always takes a plural verb.

-- Either... or... Is used when something is true for one or two people, things, etc.

-- Neither... nor... Is used when something is not true for two people, things, etc. The verb can be singular or plural.

-- Not only... but also... Is used when something is true for two people, things, etc.

-- Whether... or... Is used when you have have to make a choice between two possibilities and you are not sure.