Ответ:

1 if he has a problem he will speak to the teacher.

2 I will go to the doctor if my hand hurts tomorrow

3 He won't be happy if he misses the bus

4 If my sister goes to music lessons my mum will buy to her a guitar.

5 If you see the film tomorrow, you will know how the story ends

6 The teacher will give me abad mark, if I don't

give her my homework

7 You won't see me if you come late

8 If you don't switch off your mobile phone people will get angry

9 The picnic will be disaster if the weather is bad

10 If we don't go to the shops we won't have enough food