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If people (not to drink), they (to die).
If you (to eat) bad food, your health (to become) worse.
If you (not to feel) well, you (to go) to the doctor.
If babies (to be) hungry, they (to cry).
If I (to be) thirsty, I always drink fresh water.
If Tom (to have) a birthday party, he usually (to invite) a lot of friends.
If I (to have) a headache, my mother usually (to give) me some medicine.
If I (to cough), I (to drink) hot milk with honey.
If you (to fly) by a budget airline, you (to have) to pay for your drinks and food.
If we (to be) late for school, our teacher (to get) angry.