— Oh, excellent, It’s worth reading a second time.
四、动词不定式作动词tell, show, understand, explain, teach, learn, advise, discuss, ask, decide, wonder, find out 等词的宾语时,前面常带wh – 引导词。即how, what, whether, where, when, who 等 + to do。但why + 不带to 的不定式。
注意此用法的不定式的逻辑主语需与主句的主语或宾语保持一致,否则用宾语从句。例如:
He showed us how to do the work. ( = He showed us how we should do the work.)
I don’t know what to do. ( = I don’t know what I’ll do.)
Can you tell me why do it ?
五、动词不定式在介词but, other than 后面时,如果介词之前有行为动词do 的某种形式,那么介词后的不定式不带to,否则就要带to。另外在can’t choose but, can’t help but, can’t but 后面的不定式也要省略to。如:
We could do nothing but / other than wait.
We had nothing to do but / other than wait.
We have no choice but to wait.
I can’t choose but laugh.
★不定式、分词作状语用法要点
一、不定式作状语
He sat down to have a rest. (表目的)
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