Hi, Naamplao!
Thanks for explaining.
With the first two sentences, I wanted ask what YOU would write in an instructions book as a title above a text:
"How to use this microwave oven" OR "How use this microwave oven"
With another example:
Which title would you write in the instructions of a pain-killer's pack as a title:
"When take the medicine?" OR "When to take the medicine"
I emphasize that I know these are not complete sentences but they occur in everyday life mainly in instructions mentioned earlier and I never know whether (to?) use bare infinitive or infinitive. (again: do I need to in this last sentence?
Thanks a lot. Bye for now,
Balázs.