英语：unit3 lesson3 wedddings同步辅导与测试（北师大版必修1）

Unit 3 Celebration

Lesson 3 Weddings同步辅导与测试

一、 should, ought to 与 must

1) should, ought to表示“应该”，ought to表示义务或责任，比should语气重。

1. I should help her because she is in trouble.

2. You ought to take care of the baby.

2) 表示劝告、建议和命令。should, ought to可通用，但在疑问句中常用should。

1. You should / ought to go to class right away.

2. Should I open the window?

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