...if Miss Li was a teacher.他问我李小姐是否是一位老师。Nobody knows whether / if he likes this birthday present. 没有人知道他是否喜欢这份生日礼物。(3)whether...or not 和 if... or not引导的从句不在句子开头时(or not 和 whether / if 之间必须有其它...
...定式的助动词或者情态动词的前面。例如:We still do not know exactly what happened . 我们还是不知道到底发生了什么。(摘自《朗文当代高级英语辞典》第6版 still词条)这里的 do not know 是谓语动词的否定式,其中的do not 是构成谓语动...
Increases whichs previously occurred in as little as 5 seconds now may
take five times as long to achieve.老师们,这个句子to achieve意味着什么?为什么不接宾语?as long 又如何去理解?麻烦老师帮学生解答一下?