I learned that we should work hard./Jack London was a famous writer./ life was beautiful./no one was perfect./ every dog has its day.
这个句型中,that就是来引导宾语从句的,所以你在that后写的那个句子只要符合逻辑和事实,通顺合理就可以了。
追问你能再给我举个I learned that ……从句是将来时的吗,用will.
追答I learned that a famous scientist will come to our school next week.