I like someone who....

is the relative pronoun Optional or necessary? I'm looking for someone WHO I can go on vacation with

Complete: Most workers would prefer a boss...

Jane always promises to do something but then she never does it. She is so______

Complete: I'd rather travel with someone....

Someone who doesn't like to share what they have with others.

Complete: My favorite friends are people...

is the relative pronoun optional or necessary: I like classmates WHO help me when I have questions.

John is so __________. He always have such great ideas and never takes credit for them

is the relative pronoun optional or necessary? I like classmates WHO I can do extra class activities with