Don’t let +第三人称代词或名词+动词原形 Don’t let them play in the street.
三)What else do you have to do ? We have to clean the classroom. 你们还得做什么? 我们还得打扫教室。 1. else 其他的,只修饰特殊疑问词和不定代词,且位于其后。
Where else did you go last Sunday? 上星期日你去过其它地方吗?Nothing else, thank you.不要别的了,谢谢。
other 修饰名词,且置于其前。 What other animals do you like?
2. have to 不得不 有时态、人称和数的变化,指外部环境有要求,多表达客观要求。
must必须无时态、人称和数的变化,着重指说话人带有强烈的要求,多表达主动的意思,出于本人自觉。 I must do my homework now. 我现在必须做作业了。(主动)
I have to do my homework now. 我现在不得不做作业了。(被动)
I didn’t have to stay at home last night. 昨晚我不必呆在家里。