Помогите поставить глагол в правильную форму. Предложения с 4 по 20

4) if I see, I'll tell5) will buy, I ask6) what will you do, you fail7) who will help, you're in difficulty8) mum likes, she will let9) I'll take, it rains10) she will learn, she has11) will you forgive, if you know12) if it's cold, I'll put13) plane arrives, I'll come14) if you are out, I'll leave15) we will watch, if you recommend16) if he has, he will go17) if there is, we will eat18) if it is, we will go19) I'll let you know, we decide20) if she stays, she will cook