改正下列各句中动词不定式的用法错误
问题描述：
改正下列各句中动词不定式的用法错误
1,mother had her son to do the homework again.2,i have been looking for my watch all the morning but it's nowhere to see
答
第一题是have sb do sth,使役动词,让某人做某事,改为mother had her son do the homework again
第二题应该是表示不定式的被动态,改为but it's nowhere to be seen