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[00:00.00]恒星英语学习网 Lesson 67 The sixty-seventh lesson
[00:41.48]must 应该，必须
[00:48.56]You must stand in line!
[00:58.20]You mustn't sit on the desk.
[01:07.21]You must get up and get ready for school.
[01:17.45]You mustn't eat anything until you see the doctor.
[02:05.18]when,before,after引导的时间状语从句
[02:27.30]You should be quiet when you are in the reading room.
[02:48.44]When I grow up,I'll be a nurse and look after patients.
[03:02.67]I can't go out before Mum comes back.
[03:15.66]After I cooded the food,I went to busy some flowers for Dad.
[04:40.69]if 引导的条件状语从句
[05:05.66]If you don't go soon,you'll be late.
[05:16.42]If you are ill,you'll have to see the doctor.
[05:28.49]If you don't want to go alone,I'll go with you.