washing / was cooking

washed / cooked

washes / is cooking

wash / cook

was phoning

phone

did phone

phoned

are sleeping

were sleeping

slept

sleeping

were standing

was standing

was stand

standing

was / having

were / sleeping

was / doing

were / doing

is having

are having

was having

were having

is riding

are riding

was riding

were riding

don't wear

weren't wearing

haven't been wearing

haven't worn

have all been sitting

don’t sit

were all sitting

are all sitting

while the supevisor was watching them

when the director has inspected the class

while it is raining

since half past seven

was, eating

were, eating

am, eating

is, eating

Were, playing

Was, playing

Are, playing

Do, playing

was listening

listened

am listening

am listen

When the bell was ringing, they did an exercise

They doing an exercise and the bell rang

While the bell rang, they doing an exercise.

They were doing an exercise when the bell rang.

I was watching TV and my mother coming

My mother come while I was watching TV

My mother was coming when I was watching TV

My mother came while I was watching TV

The cars crashed when we were sitting at the park.

The cars were crashed while we were sitting at the park.

The cars crashed while we was sitting at the park.

The cars crashed while we were sitting at the park.