1. Do you know each other?
你们相互认识吗？ni men xiang hu ren shi ma?

2. Do you often go there?
你/你们经常去那里吗？ni/nimen jing chang qu na li ma?

3. Chinese students invited us to drink tea at dorm
中国学生邀请我们去宿舍喝茶 zhong guo xue sheng qing wo men qu su she he cha

(Inviting sb to drink tea is an expression in Chinese,which basically means they're going to question you. If this sentence said by your friends,that's ok! If Chinese gov said so.....wow...big trouble is going to happen to you.)

4. Do they all study in here?
他们都在那里学习吗？ni men dou zai na li xue xi ma?

5. I don't go there often.
我不经常去那里

Denis, wan shang hao!

Denis,晚上好！

加油↖(^ω^)↗

Qiu lao shi, wan shang hao, xie xie ni.

Hello Denis 

________________

1. Do you know each other?
你(ni3)认(ren4)识(shi2)他(ta1)吗(ma1)？

2. Do you often go there?
你(ni3)经(jing1)常(chang2)去(qu4)那(na4)里(li3)吗(ma1)？

3. Chinese students invited us to drink tea at dorm
中（zhong1)国(guo2)学(xue2)生(sheng1)们(men)在(zai)宿(su4)舍(she4)邀(yao1)请(qing3)我(wo3)们(men)喝(he1)茶(cha2)。

4. Do they all study in here?
他（ta1)们(men)都(dou1)在(zai4)这(zhe4)里(li3)学(xue2)习(xi2)吗(ma1)？

5. I don't go there often.
我(wo3)不(bu4)经(jing1)常(chang2)去(qu4)那(na4)里(li3)。