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

Definitely "on the sofa", sitting in a sofa would mean you're literally getting inside of it, like taking off the cushions and getting inside the actual sofa, which i've never seen anyone do

sit on the sofa sounds right to me. in the sofa sounds like you want to go inside the sofa - zip open the cushions and sit inside the cushions themselves!

Hi,friend,i am not from english speaking country,so i am not sure whether my answer is correct or not.But as i have learned,i think both is ok,when you use "on",you mean you have not totally into the sofa;while when you use "in",you mean you put the whole of your body into the sofa,which is often the case when the sofa is very soft. I think more people will choose "in".So i recommend you use "in".

You sit "on" the sofa. To say you sit in the sofa is saying you sit inside it. And we don't typically get over and crawl up into the inside of the sofa! However, the odd thing is that we sit in a chair! I have no idea who made all these rules!

'on the sofa' sounds right to me.:) 'in the sofa' would mean that you have some entrance or door to enter your sofa for whatever purpose you might have. hahaXD think of 'on' as being a part of 'on top of', so 'on the table' would mean 'on top of the table'. 'in' would mean getting into something, like 'get in the car'. i hope that helped.:)

Actually, the correct term would be 'on the sofa.' Why? Because if you are 'in in the sofa' it means your whole body is literally inside the sofa. This is usually not the case. If you are 'on the sofa' it means that your body is on top of the sofa. I can see where your confusion comes from, but the correct term is on. And this comes from a seasoned English class veteran.