a. I was going (go) to work when my car broke

A. I was going (go) to work when my car broke down (break down).

b. I (fall down) when I (clean) the windows.

c. I (study) for five hours and then I (go) to sit the exam.

d. Yesterday I (go) to the cinema and later I (meet) my friends.

e. While I (study) my brother (listen) to the radio.

f. I (not go) to the school because I (have) a terrible headache.