Do you know if he is the doctor___saved the boy's life?A.whom B.which C.who

do you know that he is right?和do you know if he is right?哪个正确?为什么? ：-Do you know if he is coming?-It doesnt hurt to ask,does it? Do you know who is he? I heard that he had fallen ill for three days.Do you know if he is better now?单句改错 Do you know Who he is?能不能是Who do you know he is Do you know ----------he will be back.that或if, Do you know if ____back next week?If he ___ back,please let me know.为什么 Do you know if he is the doctor___saved the boy's life?A.whom B.which C.who （ ）Do you know if he _______free next WednesdayA is B will be C does D has Do you know if the man is badly ill 翻译 ---What is our head tearcher like,do you know? ---Oh,he is very kind____he looks very serious.---What is our head tearcher like,do you know?---Oh,he is very kind____he looks very serious.A.because B.thoughC.if D. Do you know where he is works?这句话对吗 Do you know what he is _________ over there? do you know who he is do you know who is he do you know what he is do you know what is he只有一句话是对的,哪句话? where is he?Do you know?怎样合成一句 Then how do you know he is happy?急用! Do you know why he is a___ good health? Do you know who he is 正确吗语法?