teach的过去式和过去分词形式

Children must be taught the difference between right and wrong.

必须教儿童分清是非。

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

我希望我们教给了孩子分辨是非的.能力。

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

数据库可以用作大学里的一种教学辅助手段。

Does the quality of teaching depend on class size?

教学质量取决于每个班的人数吗？

He was put off science by bad teaching.

教学不好使他失去了对理科的兴趣。