作者：贾利民
1号演播厅：当主句谓语动词为hope，wish, agree, decide, choose等，其后接that引导的宾语从句，且主从句主语一致时，从句可以简化成不定式结构。如：
He decides that he will visit our school.
→ He decides to visit our school.
2号演播厅：主句的谓语动词为感官动词see, hear, watch或动词find等时，宾语从句常简化成"感官动词 / find+宾语+宾语补足语"结构，此时的宾语由从句的主语转化而来，而宾语补足语通常是形容词、省to的不定式或动词的-ing形式。如：
I saw that some children were playing in the park.
→ I saw some children playing in the park.
They found that the box was very heavy.
→ They found the box very heavy.
3号演播厅：动词seem后的宾语从句，也可以转化成不定式结构。形式主语it通常需用从句主语替换。如：
It seems that he is ill.
→ He seems to be ill.
4号演播厅：由特殊疑问词引导的宾语从句，当主从句主语一致时，宾语从句可简化成"疑问词+不定式"结构。此时主句谓语动词常为learn, know, forget, remember, decide等。如：
I don't know how I can get there.
→ I don't know how to get there.
5号演播厅：当主句谓语动词为tell, ask, show, teach等时，后接双宾语，从句由疑问词引导且主语与主句的间接宾语相一致时，宾语从句也可简化成"疑问词+不定式"结构。如：
Please tell me where I should show my ticket.
→ Please tell me where to show my ticket.
[ 特别提醒]从句主语和主句的间接宾语不一致时，为了防止句子产生歧义，宾语从句一般不简化。如：
He didn't tell me when he was coming back.
→ He didn't tell me when to come back.
翻译1：他没有告诉我他什么时候回来。
翻译2：他没有告诉我(我)应该什么时候回来。