英语句子：We hope to have more time to practise some knowledge that we often make mistakes andWe hope to have more time to practise some knowledge that we often make mistakes and more important.老师说,这里不能用that,因为that后面的we often make mistakes是一个完整的句子,that没有充当主语或宾语,同时后面的 and more important有些突兀.那正确的句子该怎么改正啊?在原基础上,进行最小幅度的改动.

英语句子：We hope to have more time to practise some knowledge that we often make mistakes and
We hope to have more time to practise some knowledge that we often make mistakes and more important.
老师说,这里不能用that,因为that后面的we often make mistakes是一个完整的句子,that没有充当主语或宾语,同时后面的 and more important有些突兀.那正确的句子该怎么改正啊?在原基础上,进行最小幅度的改动.