Question

Use must/mustn't

1 It's my sister's birthday. (buy a present)
2 He feels very sick. ( call an ambulance)
3. My clothes are very dirty. (wash them)
4. I've got toothache.(not eat sweets)
5.I want to take the bus. (buy a ticket)
6 I have a sore throat. (not drink cold water)
7. Grandma can't see very well. (wear glasses)
8. My grades are poor. ( study more)
9 It's very cold in here. ( turn on the heater)
10. It is very hot in here.( open the windows)
11. Let's go into that rom.( not go there)
12. Kevin has an apointment. ( not be later)

Answer 1

1. I must buy a present
2. I must call an ambulance
3.I must wash them.
4. I mustn't eat sweets.
5. I must buy a ticket.
6. I mustn't drink cold water.
7. She must wear glasses.
8. I must study more.
9. I must turn on the heater.
10. I must open the windows.
11. I mustn't go into that room.
12. He mustn't be later.

Answer 2

I must to buy her a nice present.
I must to call the ambulance 
I must to wash my clothes
I musn't eat so many sweets
I must to buy a bus ticket
I musn't drink cold water.
I must to wear glasses
I must to study more for better grades
I must to turn on the heater
I must to open a window is too hot in here
I musn't enter in that room but I want to.
I mustn't be late for his meeting