be able to的be可以换成is/was/am/were/are对吧tell sb not to do/ask sb not to do的not在对话中还是用not吗?在什么时候not需要用don't/wouldn't······!简单点说,好像老师是说过句子开头not需要根据语境变成don'

be able to 和will be able to 的区别 be able to 的用法 be able to的用法 be able to的词性 be able to的用法 be able to 的用法 be able to 的意义 be able to的be是什么词 be able to可以省略to么? 是be able to 还是is able to No one加be able to,还是is able to? 句型转换be able to换成两个词 是什么 byrd know that he would be able to reach the South Pole which was 300miles away这里的be able to 可以换成could吗 如果不能为什么 who is able to be be strong tooegotisical needs to we should be able to catch thembe able to should 能不能换成can Who is able to be egotistical needs to be strong too.的中文意思 be able to 用法 be able to中文