英语句子结构分析.The winter vacation is coming,but what should be a

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英语句子结构分析.
The winter vacation is coming,but what should be a pleasant trip home for students can be a challengingjourney.
在这句话中" what should be a pleasant trip home for students " 是不是作主语?这句话可不可以改成" what a pleasant trip home for students shuld be "

这句话中" what should be a pleasant trip home for students " 是主语从句作主语
这句话可以改成" what a pleasant trip home for students shuld be " 不过是从句中的主语和表语调换了一下而已 .
再问：主语和表语的位置可以互换吗？可否举一两个例子! (what + 助动词 + 动词原形 + 主语) 整句作主语, 这种形式比较少见. ( what + 主语 + 助动词(可选) + 动词 ) 整句作主语比较常见, 例如: ( what I have to do is ......) 是不是只有是be 动词(主表结构) 才能把动词致于主语之前, what 之后.
再答：主语和名词作表语的位置可以互换如 my job is teaching english 和 teaching english is my job (what + 助动词 + 动词原形 + 主语) 整句作主语, 这种形式并不少见 what 引导主语从句并作从句中的主语如 what happened to him is unknown. ( what + 主语 + 助动词(可选) + 动词 ) 整句作主语比较常见, 例如: ( what I have to do is ......) what 引导主语从句并且在从句中作宾语如果主语从句中是be 动词(主表结构) 并且是名词作表语/主语可以把动词致于主语之前, what 之后. 因为名词作表语一般可以和主语互换。

英语作文Winter vacation is coming the winter vacation is coming ,what are you going to do?的意思, The winter vacation is coming what are you going to do? 英语作文 The summer vacation is coming 大学英语情景对话summer vacation is coming but student A is not going The winter vacation is . 英语句式结构分析The proposal that is submitted should be based upon The winter holiday is coming.By___,what plans have you___for 英语翻译Winter vacation is coming.We’re happy to welcome the hol Hello,everyone!THE winter vacation is coming.We can make out 求助英语句子结构问题“It is convenient as,A should be……”. What seems to be the problem?求句子结构分析