6.had better是情态动词,所以其后加动词原形,即:had better do sth,排除BC;
如果是否定的话,直接在情态动词had better后面加上not,即:had better not do sth,排除A.
7.decide是及物动词,所以其后加宾语.
而where to go for your holidays是所谓的“疑问词 + 不定式”结构,它相当于一个名词短语,可以做decide的宾语.
其中where在不定式短语(to) go for your holidays中充当地点状语.
8.固定结构“使役动词make + 宾语sb/sth + 宾语补足语”如果使用不定式做宾语补足语时,主动句中必须省略to,而在被动句中必须补上to.
即:make + his sister + cry;be made to cry
9.此句中的want to = want to go shopping,即不定式后面跟的如果是行为动词原形,且该动词在前文中已经提过,则为避免重复,可以把它省略到to为止;
固定短语:want sb to do sth “想要某人做某事”,对应该句的wants me(sb) to go with her(to do sth).
10.smile是不及物动词,不能直接加sb做宾语,排除AB;
固定短语:laugh at sb“嘲笑某人”;
tell sb not to do sth变成被动结构即:sb be told not to do sth