英语语法帮助i think______necessary for us students to practise spe

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英语语法帮助
i think______necessary for us students to practise speaking english everyday !
a that is B it is C that D that is
为什么选B 可不可以等于 i think it necessary~~~ 把is 去掉呢!
两者有什么区别

绝对可以!
区别:i think it necessary~中,it作了形式宾语,而i think it is necessary~中it作了形式主语.
后一句中,加了系动词,所以构成了一个完整的从句,it在从句中作了主语.而前一句的it是宾语,故为形式宾语,只不过,necessary for us students to practise speaking english everyday !作了宾语补足语而已.
补充:高级语法中,有一个说法,叫“尾重原则”,即句子前的成分太大,为了舒服,就将其置于后面,前面用一个形式主语或形式宾语来“占位置”而将真正的主语或宾语以不定式（或其他）的方式放在后面.
二楼和五楼说的也对,只是那样做太麻烦.
而且应该是i think it necessary that “we” students practise speaking english everyday !（us改作we）才对吧

______important for students to practise English选择题 Most students practise ( )English every morning.(speak)该用spe 英语语法问题Our English teacher suggested us to practise writing m 连词成句 us,important,to,practise,very,English,for,it's,more do you think it necessary for us to practise speaking englis 改错 That's important for us to practise speaking English.How I hear this dictionary is very ____ for us students （合作）is important for us students to study. I am looking for a foreigner be my friend to practise oral e 英语翻译Students often want to practise their English outside cl i want to practise my English 英语语法提问If we were closer to the sun,it would be to hot for us