Terry was fatter.
Terry didn’t like to be thin. (didn't)
Gary was sure his keys were in his pocket
Gary was sure he hasn’t forgotten his keys. (forgotten)
Last summer, Julia got up early every morning.
Last summer, Julia had to wake up early every morning. (to)
I thought the book seemed familiar.
I thought I had read the book before( had )
When he was younger David played tennis.
David used to play tennis when he was younger. (used)
We missed the bus so we took a taxi.
We had to take a taxi because we misses the bus. (had)
In those days, we spend summer in the mountains.
In those days, we would spend the summer in the mountains. (would)