这句话中“being”为什么意思?I can't understand why he is being so selfi

这句话中“being”为什么意思?I can't understand why he is being so selfi What I like best about this job is being outdoors,这句话中being是 It is not easy being your age这句话中,为什么是being so they can’t understand why the doctor do some things这句话语法错 i can't understand why our boss is late.he ___the early bus. --I can’t understand why our boss is late. --He _____the ear I don't understand how someone can MAKE love without BEING i i don't like being criticized中为什么要用being He is always being busy .这句话对么? I'm sorry.I can't accept your _______ of being so rude to us –Why did he say so?--Sorry,I don’t understand ______ he has Why is being a member if successful team so beneficial