I would use a comma in both. No, you don't have to use commas here, but there is no good reason not to.
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sinai_beachHey, do we have to put a comma in sentences like these?0 conditional:If you don't water plants, they die. or If you don't water plants they die.1 conditional:IF it is cold, we will stay at home. or If it is cold we will stay at home.One book says that we put a comma but another book says that we don't have to. I am a bit confused by the instructions.Thx in adva