112. Any, none, some, all and most S-V agreement

The pronouns ANY, NONE or SOME and the nouns ALL and MOST: 1. take singular verbs when they refer to a unit or quantity Some of the money was missing. An amount of money. 2. take plural verbs when they refer to number or individuals Some of the gold coins were missing. A number of coins. The pronoun NONE 1. takes a singular verb when its meaning is "No Single One" or "Not One" None of the gold coins was missing. Not one of the coins 2. takes a plural verb when its meaning is "No Two" or "No Amount" None of the goods were missing. no amount of the goods None of the forests were destroyed. no amount of the forests When the subject is a fraction or a word such as HALF, PART, PLENTY or REST, its intended number is suggested by the object of the preposition that follows it. Three-fourths of the enemy's army is wounded. Three-fourths of the enemy's soldiers are wounded.

Usage
It is sometimes held that none can only take a singular verb, never a plural verb: none of them is coming tonight rather than none of them are coming tonight. There is little justification, historical or grammatical, for this view. None is descended from Old English nān meaning ‘not one’ and has been used for around a thousand years with both a singular and a plural verb, depending on the context and the emphasis needed

en.oxforddictionaries.com/definition/none