If people (to throw) rubbish into the ocean , they (to kill ) millions of fish.
If the air ( not to be ) clean , you (to have) to wear a mask.
What he ( to do), if he ( to hear) the news?
If she (to do ) sport, she ( to lose) weigh.
How long you (to do ) your homework?
At the weekend their cousin often (to stay) at home and ( to watch) films
Dan and I ( to play) chess all the afternoon, when suddenly my phone ( to ring)
Look ! Her hands ( to be) dirty. She (to work) in the garden .
Yesterday I ( not to want) to stay late, I (to be) .
It ( to be ) dark now. The sun ( not to rise) yet.
We ( not to hear) you now. Repeat it, please!
When he (to come) to his granny's place, she (to leave) twenty minutes before.
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