Question

有do无to三种情况

Answer 1

1.主语部分有 to do ,系动词 is 或 was 时 ,作表语的不定式通常省去 to。如:
The only thing you have to do is press the button.你必须做的惟一事情是按按钮。
2.作介词 but ,expect ,besides 的宾语,前面又有实意动词 do 时,不定式通常省去 to. 如:
He said that Chen Shuibian had nothing to do except push a pro-“independence” timetable.
他说陈水扁除了推进支持“独立”的时间表外,什么也没有做。
3.主语部分暗含 to do,表语中的不定式通常省去 to。如:
All I want (to do) is go to school and study hard .我想要(做)的就是上学,努力学习。