Which should I choose? "On the sofa "or "in the sofa"?

Please help me. Which is right? "sit ___________ the sofa" Someone said "on the sofa" while someone use "in the sofa". Would you please tell me which is right and why?

How do you think of "stupid girl (pink)"?

I've watched the video of this song. I think it's interesting but I'm afraid I can't understand exactly what she wants to tell us. Especially when the girl vomits in the toilet, I wonder what she's...

“this morning” or “today morning”？

Who can give me the right answer? In the English speaking countries, which is right, "today morning" or "this morning"? Please help me.

Who can tell me the right words of he song "Can you feel it"?

I don't know if you have heard about the TV program "if you are the one"(Maybe the English name is not exactly. It's a program just like the program "take me out" in the USA). They use a song as...

What should I do to be a filial piety daughter？

I don't even know how to express. Perhaps "filial piety" can't be used exactly to describe that kind of traditional virtue of China. I just want to know the westerners' attitude towards the virtue....