sounds like the russisan pronunciation is so difficult for us.

知道关于=knew about 听说过=heard of

seat ticket includes hard seat and soft seat, so it has 2 typess prices. hard sleeper includes upper berth,middle berth and lower berth,so it has 3 types prices soft sleeper includes upper berth and lower berth,so it has 2 types price.. hope it would be helpful...

好久不見！！

請你幫我一下？我寫得對嗎？ 謝謝你

他們在中國城的一個飯館吃晚飯。他們點的有素菜，魚等等，都很好吃。

A: 我覺得住在校內比較好。很方便。
B: 住在校內是方便，可是太貴了。

請你在收據上面簽字。

你陪不陪我去購物中心去買一雙運動鞋？

老師，可以你告訴我怎麼學中文？

我現在要去上課了！再見！

personally,i think both is ok.But deleting it is more better.. actually, you can see so many time adverbs like 过，了，着 in sentences. 过,了 can be used in past tense and perfect tense. 着can be used in present continuous tense. 了 mostly is used at the end of sentence,somtimes without any meangings

If I take the Chinese studies degree，what will my Chinese level be like compared to if I take the Chinese degree? 如果我读中国研究学位，比起读汉语学位来我的汉语会达到什么水平？or 如果我读中国研究学位，比起读汉语学位来我的汉语会怎么样？ it means what your Chinese level will come to when you take Chinese studies degree compared to Chinese degree. it sounds like you want to make a choice of both degrees to get better Chinese level,right?

it is kinda words like "use,apply,utilize,emply,bestow,", in most situations they can be used conveying the same meaning...