1.If he finishes his homework,his mother will let him watch TV.(改为否定句）.
If he (can't) (finish) his homework,his mother (wouldn't) let him watch TV.
2.Mary is able to pass the exam,she works hard.(用if连成一句话）.
(If) Mary (works) hard,she (will) be able to pass the exam.
3.If you bring friends from other school,(the teachers will ask them to leave).(就括号内部分提问）.
(What) will (happen) if you bring friends from other school?
4.Get up early,or you'll be late for school.(改为同义句）.
(If) you (don't) get up early,you'll be late for school.
5.His father went to work by bus yesterday.(改为同义句）.
His father (went) (by)(bus) to work yesterday.
1.If your teacher gives you a "D" for your study at school,will you be happy?
如果你的老师为你在学校的成绩打了丁分,你会开心吗?
2.The teachers must work hard if they want good grades.
如果教师们要取得好的等级,他们就必须努力.
3.In America,if a class is boring,a sthdent can press the "boredom button" on his or her desk.
在美国,如果学生觉得一堂课很闷的话,可以按座位上的‘无聊’按钮.
4.The teacher should make the class more interesting.
教师应尽力让课堂变得有趣.
5.If there are too many lights on in his or her class,the teacher will get bad grades.
如果一个教师在一堂课上被按了太多次‘无聊’按钮,他就会得到很差的等级.