make、have、let三个为使役动词，其后跟省略to的不定式作宾语补足语，即：makehavelet sth.（让某人做某事）例如:The teacher made him wait outside.(主动语态)；
在被动语态的句子中，则要还原不定式的'符号to,即：He was made to wait outside.也有makehave sb. doing sth.的结构，意思为：让某人一直做某事，强调动作的持续性。
例如：The boss made the workers working from dawn to dark.(老板让工人们从黎明一直工作到天黑。)
