Alice started playing tennis six months ago. FOR
--> Alice ... six months.

Skiing is more exciting than skating. AS
--> Skating ... skiing.

Doctor Williams is a cardiologist and has his surgery on the second floor. WHOSE
--> The doctor Williams, ... , is a cardiologist.

She will give them permission to continue excavations on her property. GIVEN
--> They ... excavations on her property.

"Did you remember to lock the door?", my father asked me. IF
--> My father asked ...lock the door.

It is not necessary for us to go to school tomorrow. HAVE
--> ... go to school tomorrow.

Perhaps Anne is at home. BE
--> Anne ... home.

If it doesn't rain soon, a lot of our crops will be lost. UNLESS
--> ..., a lot of our crops will be lost.

The police forced the criminal to get into the car. MADE
-->The police ... into the car.

Steve left before my arrival. ALREADY
--> When ... .