She behaves as if she were a child.为何用were而不用was?

She behaves as if she were a child.为何用were而不用was? 请帮我看一下这个句子是否有语法错误.She behaves as if she ( were) a child.were是不是应该改为was?如果不是.请说明理由. He behaves as if he were ill.是虚拟语气吗? He behaves like an adult.He behaves as if he were an adult.区别在哪?哪一句可翻译为：他表现（举止）得像个大人. 关于as if引导表语从句和宾语从句.语法书中说下面这句话中as if引导的是表语从句：It looks as if it is going to rain.那么为什么有的语法书中说下面的句子中as if 引导的是壮语从句：She looks as if sh ‘who does that shop assistant think he is?he behaves as if he owned the grocery.’who does that shop assistant think he is? Who does that shop assistant think he is?He behaves as if he ______ the grocery.A.own B.owned CWho does that shop assistant think he is?He behaves as if he ______ the grocery.A.own B.owned C.will own D.has owned Who does that shop assistant think he is?He behaves as if he ______ the grocery.A.own B.owned CWho does that shop assistant think he is?He behaves as if he ______ the grocery.A.own B.owned C.will own D.has owned He behaves------a baby.横线处用as还是like it looks as if she 's she sings songs as if she ___(be )a bird. she actes as if she were a great ______she actes as if she were a great ______(music)from Britain She did not act as if she had not.She did not pretend she had not seen him.She did not act as if she had not.She did not act as if she had not. she的sh的音标 A young woman was driving through the _36 countryside.It was dark and raining.Suddenly she saw an old woman _37 the side of the road,_38_ her hand out as if she wanted _39_.“I can’t _40_ her out in this weather,” the woman said to herself,so sh if she has the misfortune of knowing anythingshould conceal it as well as she as if的用法1.She loves the boy as if she were his mother2.She looks as if she were five years old3It seems as if our team is going to win为什么1和2的时态不一致 She performed a grand toilet as if gor aa ball.