For keeps

Always, forever.I told the boy that he could have the baseball bat for keeps.

For instance

For example.They have everything. For instance and sushi and hamburgers."

For hours on end

For many hours.The boy often plays video games for hours on end.

For all I care

I do not care if something happens."For all I care, you do not have to meet me again."

For all (something)

In spite of something, even with something.For all the time that the boy spends studying, his marks are very low.

Fall over backwards (to do something)

To do everything possible to do something or please someone.The teacher fell over backwards to help his students.

For the time being

Temporarily, for now, for awhile.We really need a new car but for the time being we will continue to use our old one.

For the sake of (someone or something)

For the good of someone or something.My father decided to quit his job for the sake of his health.

For the record

A record of a particular fact is made.For the record, I told the police officer about the events of the previous year.

For the most part

Mostly, in general.For the most part I was finished my work so I decided to go home.