怎样将直接引句改为间接引句?多举几个例,至少4、5个例子.

1、主语要变化
例如：He says,"I have a sister."改为He says he has a sister.
2、时态要变化
例如：He said,"I have a sister."改为He said he had a sister.
3、句子语序要变、标点符号要变
例如：He asked," When can I go?"改为He asked when he could go.
4、直接引语是一般疑问句时要加疑问词if 或 whether
例如：He asked," Can I do it?"改为He asked if/whether he could do it.