1.I don't know what I should do,

I don't know what to do.

2. Could you tell me where I can find more information about this?

Could you tell me where to find more information about this.

3. He's not sure when he should start the computer.

He's not sure when to start the computer.

4. They wondered how they could deal with this problem.

They wondered how to deal with his

5. I can't decide whether I should answer his letter. 

6. Tell me how I can improve my pronunciation of English.

Tell me how to improve my pronunciation of English.

7. He has no idea who he should call for help in case of emergency

He has no idea who to call for help in case of emergency.

8. He asked his father when he should leave for the bus tomorrow.

He asked his father when to leave for the bus tomorrow.

9. She wondered how she can tell this news to her parents. 

she wondered how to tell this news to her parents.

10. My mother couldn't decide how much money she should spend on Tet holiday.

My mother couldn't decide how much money to spend on Tet holiday.

11. Complete the following pairs of sentences by using "wh-words + to-infinitive".

Rachel: Are you going to buy that overcoat?

You :I don't know (1)  to buy it or not.

Tom: What time do you think we should leave?

@HOCTOT