在不少书上看到，说是 be necessary to do sth 的主语必须是 it（形式主语）。如：Was it necessary to tell my mother? 有必要告诉我妈妈吗?Sometimes it is necessary to say no. 有时候拒绝是必要的。但是我觉得Am I necessary to tell my mother? 也很...
He should have been given (should give) more responsibility when he was youger.should have done 表示本该做的没做请问老师，这里能否填 should be given？在他年幼时，他应该被给予更多的责任？为什么？
The challenge we face is to find ways to meet the needs of our growing
population while _______(protect) the environment.这里填protecting是省略了主语和be动词吗？但是主语不是the challenge吗?
... I think it’s good for the country, if I think it’s good for what will be certainly the largest trade deal ever made … I would certainly intervene if I thought it was necessary.” 请问高手，在第二个if句子，为何要有what will be certainly, the largest trade deal ever made ...
It would never do to be, perhaps, within arm's length of
happiness and not to try for it, at the risk of dying in the attempt, to try
for it and hand it over at last to all mankind!请教各位老师，这句话如何理解？特别是红色标注部分。这句话是小说主人公要打开一扇...
...家》里看到的。请问这是什么结构？是独立主格还是省略be动词呢？谢谢各位大咖专家老师们！附上整段原文：All debilitating, to be sure. But probably not
fatal. The firm remains the world’s second-biggest aluminium-extruder with a
vast home market. Disclosure...