Grammar unit 11 prepare 5

We use the past perfect to talk about an action that happened before/after another action in the past.

example:

The bus had left when I reached the bus stop.

We had studied grammar well before we took the TOEFL test.

I had had lunch when my mother called me.

The past perfect is formed using 

had + past participle

Statement: You had studied English before you moved to New York.

Negative: You had not studied English before you moved to New York.

Question: Had you studied English before you moved to New York?

Regular :

study-studied-studied

Irregular :

take-took-taken

come-came-come

see-saw-seen

know-knew-known

get-got-got/gotten (US)

give-gave-given