teach的過去式和過去分詞是什麼？

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。

My teaching style is similar to that of most other teachers.

我的教學風格和多數教師相似。