– If you (use) less paper, you (save) lots of trees
– People (cough) a lot, if the air (dirty)
– If it (sunny) tomorrow, I (go) on a picnic
– If you (use) less paper, you (save) lots of trees
– People (cough) a lot, if the air (dirty)
– If it (sunny) tomorrow, I (go) on a picnic
-People will cough a lot, if the air is dirty
– If it is sunny tomorrow, I will go on a picnic
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