for
The French word 'pour' is used in similar ways as 'for' is in English. It can be used to indicate the purpose or reason for something (I'm studying for the exam = J'étudie pour l'examen), and it can be used to indicate who something is intended for (This gift is for you = Ce cadeau est pour toi).
I'm buying a gift for you.
The given sentence uses 'pour' (for) to show the target (you) of the action (buying the gift).
She cooks for the family.
Here, 'pour' is used to express the benefactor (the family) of the action (cooking).
I will work for our project.
This sentence uses 'pour' to indicate the motivation or purpose (our project) of the action (working).
He left for the night.
In this context, 'pour' is used to express the duration (the night) of the action (left).
I went to the bank to withdraw money.
In this case, 'pour' is used to indicate the purpose (to withdraw money) of the action (went to the bank).
I'm sorry for the mess.
This sentence uses 'pour' to show the cause or reason (the mess) for the emotion (sorry).
We need time to think.
In this example, 'pour' is used to express the purpose (to think) of the need (time).
I prepared myself for the exam.
Here, 'pour' is used to show the purpose (the exam) of the action (prepared).
They booked a table for dinner.
This sentence uses 'pour' to indicate the purpose or intention (for dinner) of the action (booked a table).