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1.讨论青少年应该或不应该被允许做什么。
2.了解家规和校规。
二.教学重点与难点
1.教学重点：围绕“sb. should (not) be allowed to do sth.”这个话题，运用所学短语进行讨论
2.教学难点：含有情态动词的被动语态的运用及构成
含情态动词的被动语态
can, could (能；会), may; might (可以)
must(必须), should(应该), will; would(愿意)
have to(必须；不得不), had better(最好)
Grammar
含情态动词(should)的被动语态
肯定句: 主语+ 情态动词+be+ 动词过去分词.
I should be allowed to drive.
否定句: 主语+情态动词+not+ be+动词过去分词.
I should not be allowed to drive.
疑问句: 情态动词+ 主语+ be+ 动词过去分词?
Should I be allowed to drive ?
Grammar Focus
(一)将主动语态的宾语变成被动语态的主语。
(二)将含情态动词的主动句式变成被动句式，即：“情态动词+动词原形”变成“情态动词+be+过去分词”，然后再在其后加“by+主动句中的主语(人称代词用宾格)”。by短语也可省略。
请看下列各句：
转变方法
You should finish your homework first.
Your homework should be finished (by you) first.
Grammar Focus
2. Parents should encourage teenagers to do social work for their community.
3. Can Lucy do her homework tomorrow instead?
Teenagers should be encouraged (by their parents) to do social work for their community.
Can the homework be done (by Lucy) tomorrow instead?
4a Rewrite the sentences according to the example.