问题 be able to 可以用 sth 作主语吗

...can’t.这是2023年高考英语老全国卷1阅读D中的一句。请问 be able to 可以用 sth 作主语吗？有些书说，be able to 可以用 sth 作主语；有些书说，be able to 不可以用 sth 作主语。请问这有什么讲究吗？谢谢！

问题 请问I suppose to be...是什么意思？有被动用法吗？

请问I suppose to be...是什么意思？有被动用法（I am/was supposed to be）吗？

问题 为什么不能用being lost to sth

Anna was reading a piece of science fiction, completely ___ to the outside world. a. being lost b. to be lost c.losing d. lost 为什么不能选择a？

问题 be位于句首的倒装句(虚拟语气)

All substances, ______, liquid or solid, are made up of atoms. A be they gasesB whether they are gasesC they are gasesD they can be gases为什么选A? B为什么不行?

问题 虚拟语气被动句的to be是不是可以省略

I know it looks rather dirty now, but imagine the house were (to be) repainted.这句话的to be 是不是省略与否句意都一样？

话题 be it time

话题 be rooted in

话题 be likely to

话题 to be adj

话题 be going to

话题 be left doing

话题 be to do

话题 be concerned by

话题 be surprised by

话题 must be doing