*require (doing) sth. 表示主语“该...了”.
如:
The floor requires washing.
地板该洗了.
*be required to do sth.表示主语必须(被要求)...如:
Students are required to attend classes.
学生必须按规定上课
All passengers are required to show their tickets.
所有乘客都必须出示车票.
*require (doing) sth. 表示主语“该...了”.
如:
The floor requires washing.
地板该洗了.
*be required to do sth.表示主语必须(被要求)...如:
Students are required to attend classes.
学生必须按规定上课
All passengers are required to show their tickets.
所有乘客都必须出示车票.