用动词不定式改写句子。。。。。急。。。看不懂要怎么做

Our teacher said to us,"Clean the window."(tell)
==>Our teacher told us to clean the window.

"Don't run across the grass,Tom."He said.(ask)
==> He asked Tom not to run across the grass.

The policeman said ,"Don't play in the street ,children."(warn)
==>The policeman warmed children not to play in the street.

The boss said to us ,"Finish the work in two hours."(order)
The boss ordered us to finish the work in two hours.

这些句子都是让你把直接引语变成间接引语，请看答案：

1.Our teacher told us to chean the window.
2.He asked Tom not to run across the grass.
3.The policeman warned the children not to paly in the street.
4.The boss ordered us to finish the work in two hours.

变的时候大多是把原句中的said要变为与引号内话语遇气相一致的动词（比如括号里的那些）就好了，还要注意人称的变化。就这两点要注意的。