Adverbs of indefinite frequency say how often something happens.

Examples are: always, ever, usually, normally, often, frequently, sometimes, rarely, seldom, never etc

Adverbs of indefinite frequency usually go in mid-position.

Gerunds and infinitives are often interchangeable, both as subjects and objects of verbs. Compare:

Smoking is injurious to health.
To smoke is injurious to health.

Study the following sentences.

The thief heard a noise. He ran away.
Hearing a noise, the thief ran away.

When used with gradable adjectives (e.g. good, bad, tired etc), quite means ‘fairly’ or ‘rather’.

The film was quite good, but it could have been better.

A relative clause is a type of subordinate clause which is attached to a head noun within a noun phrase. There are two types of relative clauses – restrictive (or defining) and non-restrictive (or non-defining). A restrictive relative clause is required to identify what is being referred to.

Every one

We use every one of before a pronoun or a determiner (the, my this etc).

Every one of the children was happy. (NOT Every one the children was happy.) (NOT Every of the children was happy.)

In this structure have means ‘experience’. The usage is rather informal.