teach的過去式英文

例句：

Children must be taught the difference between right and wrong.

必須教兒童分清是非。

I hope we have taught our children to know right from wrong.

我希望我們教給了孩子分辨是非的能力。

The database could be used as a teaching resource in colleges.

數據庫可以用作大學裏的'一種教學輔助手段。

Does the quality of teaching depend on class size?

教學質量取決於每個班的人數嗎？

He was put off science by bad teaching.

教學不好使他失去了對理科的興趣。