Hello Mina! It is good to answer you . we use inf in: 1 general statment 2 after to exept ((looking forward to )) 3 after can will could etc 4 with they we use s.p 1 repeated actions 2 ruls 3 sometimes, usually. .. 4 with singular it he she

Mina. Any time

The infinitive verb usually has to before it ...to run...to play...to work. The simple present is used for something that is happening now or will happen in the near future. Examples are He runs to work. She plays piano every afternoon. He works at the restaurant. The two tenses are not usually interchangeable as they have slightly different meanings.

Thanks Dima that was clear and simple explanation.

any thing else?