preposition: used to indicate the recipient or beneficiary of an action
This seat is for guests.
preposition: used to express purpose or goal
She saved money for college.
preposition: used to specify the intended function or use of something
This tool is for cutting metal.
preposition: used to indicate duration of time
There was an outage for two hours.
preposition: used to indicate destination or intended direction
The 6 p.m. train is for Paris.
preposition: used to indicate a scheduled time or occasion
The meeting is scheduled for Friday.
preposition: used to express exchange, price, or rate
The tickets were sold for $50.
preposition: used to show support, favor, or alignment
Her vote was for the reform.
preposition: used to express reason or cause
He received a medal for bravery.
preposition: used for comparison against a standard
She is tall for her age.
preposition: used to indicate representation or acting on behalf of someone
I signed the form for the team.
conjunction: because; since
We must hurry, for the storm is near.
