[borsbali]

Hello!

Thanks. You see there is no logics in all these mentioned below.
When it comes to instruction manuals, you should write "How to use it", but at the same time, as a title of your essay, you should write "Why (not) panic when there is a bomb on the plane?".
Why is the structure not the same? Once you must use "to" at the beginning of an incomplete sentence, other time you mustn't???

Thanks, and sorry for fussing all about it, I just want to see some logics in this grammatical question.

Thanks a lot.

Balázs.