he said that chinese history was very hard to understand.为什么用to understand?

he said that chinese history was very hard to understand.为什么用to understand? Prime Minister of the UK Gordon Brown has already p____ Daisy.He said that learning Chinese was... He said that that 'that' that that man used was he said chinese fashion is different from that in the westchinese fashion is different from that in the west是不是客观事实，is用不用变was he said that 和 he suppose that 是什么句型?请问? 英语翻译He said that 后面时态是? He said that fire c____be very dangerous. HE SAID THAT ..什么从句?宾语从句? She said that he ____(leave)already. He said that I was a flirtatious he said that they will be ok 请高手翻译一个在voa遇到的句子He said it is better for Chinese users that Google operates under legal restrictions than not at all. It is said that that was all that he said.这三个that分别是什么从句? It is said____ ____ was all ___ he said.It is said that that was all that he said. it is said that that was all that he said= it is said that that was what he said这两个句子相等吗? In his letter,he said that he___us very much(miss) He said he become____in physics(interest) 直接改间接 He said I'll go tomorrow He said that he ()()()()() He said that he couldn't solve the problem.翻译