话题 know sb to be

话题 must have been being

话题 be passionate to do

话题 be passionate about doing

话题 be out of sth

话题 be short of sth

话题 be ashamed to do

话题 be ashamed of doing

话题 spend sth (being) adj.

话题 be planned to do

话题 be possible to do

问题 be accustomed to后可接动词原形吗

几乎所有的书上都说be accustomed to中的to是介词，后接动词要用动名词doing，但今天在一本资料上看到说be accustomed to后也可动词原形，是错了吧！请专家们确认一下，感谢不尽！

问题 can't be told one from another如何翻译

Usually they are mixed together and can’t be told one from another.这句话的can't be told one from another.为什么是翻译成 没办法互相辨认？有点懵！

问题 be动词有完成时态吗

For forty years Jane Goodall has been outspoken about making the rest of the world understand and respect the life of these animals.1.has been 是is 的现在完成时，那么 be动词时有完成时态的？2.about介词短语充当什么状语呢?

问题 be sure 后面接的从句是什么从句

Well, I am not sure how to start.疑问: be sure 后面是什么从句啊？