(my friends has )or (my friends have) which of them is correct and why?​

my friends have

Explanation:

friends is plural and have is used for plural words while has is used for singular nouns.

"my friend had" would be correct bc of the singular noun, but bc friends is plural you would say "my friends have".

buy a huge library full of all the books ever written

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."