We use passive voice when we focus more on object rather than subject.

kya me apki madad kar skta hu?

This is a present perfect tense sentence. Have is used as helping verb and had is used as main verb which means "khana peena"

Do practice more and more lesson on this app. Read english newspaper daily basis. Try to speak in English.

use might if there is action verb and use might be if there is no action verb

jab hame koi Kam milke karna ho sath me sabki sahmati bhi ho