3. If you (go) to bed early today, you (not be) tired in the morning.

Решение:

Это второе условие (Second Conditional), описывающее нереальную ситуацию.

• If clause (условие): If you went (go) to bed early today,
• Main clause (результат): you would not be (not be) tired in the morning.

Ответ: went, would not be