[borsbali]

Hello!

My question for today is which of the two following expressions in quotation marks is correct:

At the beginning of a sentence:
- "What to do during panic attacks?" OR "What do during panic attacks?"
If the first one is correct, why can I remember reading the following:
- "Why panic during panic attacks?", isn't it "Why to panic"
and which is the negative?
- "Why not panic...?" OR "Why not to panic...?" as an intruction

In the middle of a sentence:
- "I do not know how to use this machine." OR "I do no know how use/using it."

Thanks for explaining all of these stated above.

Bye,

Balázs.