Question

英语非谓语动词问题，高手进，在线等~~~请详细解释

3. Professor Black had us ____ compositions every Friday.
A. to write B. written C. write D. writing
为什么答案是C? 我选D

4. My watch is broken; I must have it ______.
A. repairing B. to be repaired C. to be repairing D. repaired
为什么答案是D？ 不是有个have sth to do 的句型？

5. He has no alternative but ______ and ask for his brother for assistance.
A. go B. going C. is going D. to go
答案选D我选A 为什么？

Answer 1

have sb. do sth. 强迫某人做某事

have sth. done 找别人对某物做什么什么，example: have my hair cut 找别人来理我的发。发是被理的，表是被修的，OK？

A是谓语形式，而此处需要的是介词宾语，必须用非谓语形式。动名词和不定式都可以作宾语，因and后的ask用的是原形，所以选择不定式而不选动名词。

Answer 2

3.前面已经有had了，write就不能写成writing
4.表只能被修，所以排除A,C；如果是B，后半句应改成“It must to be repaired
5.but后面如果跟的是动作，就要加介词，跟名词可以不加

还有疑问再问我

Answer 3

全是固定搭配，OK