四种。
一、基本句型结构:
eg: Teenagers should be allowed to go shopping.
Tables can be made of stones.
2、否定句:主语+情态动词+not +be+ 过去分词
eg: Teenagers shouldn’t be allowed to go shopping.
Tables can’t be made of stones.
3、一般疑问句:情态动词+主语+be+过去分词
eg: Should teenagers be allowed to go shopping?
Can tables be made of stones?
4、特殊疑问句:特殊疑问词+情态动词+主语+be+ 过去分词
eg: What should teenagers be allowed?
What can tables be made of?
扩展资料
含有情态动词的主动语态与被动语态的转换:
1、 We (主语)can(情态动词) write(谓语) letters (宾语)in English.(宾语补足语)
Letters(主语)can (情态动词)be written(谓语)in English (宾语)by us. (宾语补足语)
2、Parents(主语)should(情态动词)allow(谓语)teenagers (宾语)to choose their own clothes.
Teenagers(主语)should(情态动词)be allowed (谓语)to choose their own clothes (宾语)by their parents. (宾语补足语)
3、You(主语)must(情态动词)clean(谓语)your bedroom (宾语)every day.(时间状语)
Your bedroom(主语)must(情态动词)be cleaned (谓语)every day (时间状语)by you.(宾语)
情态动词的被动语态构成形式及其基本用法:
1、情态动词的被动语态结构为:情态动词+be+过去分词; 其时态及句型的变化仅由情态动词完成,“be+过去分词”部分不变。
例句:
Bridges can be made of stone.
Bridges could be made of stone in the time. (一般过去时)
2、含有情态动词的被动语态变为否定句时,应在情态动词后面加not;变为一般疑问句时,应将情态动词移到句首。
例句:
Waste water should not be discharged in this river here.
Should it be done by Jones?
3、含有情态动词的主动语态变为被动语态时,要把主动语态中的宾语变为被动语态中的主语;主动语态中的谓语动词变为“情态动词+助动词be+过去分词”;主动语态中的主语变为介词by 的宾语,放在句尾(如果不强调动作的执行者,by短语常可省略)。
例句:
Parents should allow teenagers to choose their own clothes.
→ The teenagers should be allowed to choose their own clothes(by parents)。
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