Past simple - Past perfect
After they (see) the Tower, they (go) to Westminster Abbey.
After they had seen the Tower, they went to Westminster Abbey.
You study Spanish, ____?
You study Spanish, don't you?
to / used / I / travel / Europe
I used to travel to Europe
Make Past Participle pf the verb "teach"
taught
He (ask) me which animals I (see) in Africa.
He asked me which animals I had seen in Africa.
These are my pens, ____?
These are my pens, aren't they?
didn't / she / used / to / run.
She didn't use to run.
Make Past Participle pf the verb "write"
written
After Columbus (discover) America, he (return) to Spain.
After Columbus had discovered America, he returned to Spain.
It isn't snowing, ____?
It isn't snowing, is it?
like / he / used / to / play / soccer
He used to like playing soccer.
Make Past Participle pf the verb "catch"
caught
Before they (move) to Liverpool, they (sell) everything.
Before they moved to Liverpool, they had sold everything.
Linda lives here, ____?
Linda lives here, doesn't she?
they / used / to / eat / vegetables.
They used to eat vegetables.
Make Past Participle pf the verb "drive"
driven