when to, how to, what to + infinitive Verb

[Sakya kim]

1. Are the usages 'when to + v, how to + v, and what to + v' are correct?
2. Are they shortened usages?
3. Are they normal usages?

There are some contexts for this usages:
The problem lies in deciding when to intervene.
How to download your google data?
What to expect for refunds this yea?

 

[jutfrank]

1. Yes
2. No.
3. Yes.

Some teachers, such as myself, call them ''wh'-infinitives'.

 

[5jj]

How to download your google data?
What to expect for refunds this year?

Those are not correct as questions. They work (without the question marks) as titles for articles.

 

[Sakya kim]

1. Yes
2. No.
3. Yes.

Some teachers, such as myself, call them ''wh'-infinitives'.

Should I use with these usages when I do questions?

 

[jutfrank]

Generally speaking, no. At least, not in the way you've done in your final two sentences from post #1.

If you're thinking of something else, give us an example of what you mean and we'll tell you if it's right.

 

[Tarheel]

@Saky kim Try: "Should I use these when I ask questions?"