Is Sam gone?这句话算对的吗?还有:I am high up in a plane这句话有语法错误吗?

Is Sam gone?这句话算对的吗?还有:I am high up in a plane这句话有语法错误吗? Is Sam gone?这句话的回答是可以这样吗?Yes she is gone还是Yes she left请问两句都是对的吗? 那么如何解释：Is Sam gone?难道这是一个病句吗?或者是省略了什么?gone还是过去分词吗?肯定不会是现在那么如何解释：Is Sam gone?难道这是一个病句吗？或者是省略了什么？gone还是过去分词吗 can have gone和may have gone的区别这2个都表示对过去的事情表示猜测,请问用法有什么区别呢?例如,there is no light in the room,can they have gone out?there is no light in the room,may they have gone out?这两句话的用法 sam's resolution is about physical health.这句话有两个is不是就有两个谓语么…在简单句里不是错误的吗? It is gone. It is missing.请解释一下这两句话的语法? Hope is gone ,everything is gone.这句子错吗? Hope is never slept 这句话语法有错吗?还有love is never gone Is Tom as hard-working as Sam?这句话正确吗?我想表达的是 汤姆和塞姆一样努力（勤奋）吗? The place he has gone is not known yet.这句话语法上有错吗? sam says to his mother这句话表述有错吗? Does sam's father is teacher?是正确的吗? Sam is very active and does exercises every day.这句话哪个地方出错了? good girl gone bad语法gone在这啥词性?做啥成分?这句话时态是什么?我对过去的分词很不理解啊has不是省略的吧？不是gone做的是状语才省略么？ My parents have gone to Hangzhou for holiday.为什么这句话有两个动词也对啊?My parents have gone to Hangzhou for holiday.have 和 gone 都是动词啊,不是说一句话只能有一个动词吗, whatever what that is这句话是对的吗 He is now retiring from political life and has gone abroad.这句话的句子成分He is now retiring from political life and has gone abroad.句子成分怎样划分,he是主语is是谓语,后面的是什么 sam is a little bit under the weather today：S冰水am混合物 ：你怎么知道这句话包含了生病的意思