当主句是一般现在时，主语是第一人称I/we，主句谓语动词是表示“想，认为”等意义的动词，如think，believe，suppose等时，若后面的从句是否定意义，从句的否定一般要转移到主句中，即:否定前移。
它可以作动词的宾语，也可以作介词的宾语，还可以作“be+形容词”的宾语.例如:动词宾语:He said he was good at drawing.这里“he was good at drawing”作动词“said”的宾语.
The tall man is my father. Who is the tall man ?Jerry always did her homework after supper. When did Jerry always do her homework ?
