Is there a diffeeence between 이거는 and 이 ??
Is the subject particle allowed here?
I'm guessing you mean using 식당이 instead of 식당은. If so, I imagine the sentence would be valid, but it would stress 'this restaurant'. Maybe in an argument about which restaurant is big that would be the way to go.
I'm confused because I thought that 이/가 is for specific objects and 은/눈 is for objects in general. Why did they use 은 while referring to "this" restaurant?
Because the 이 is already in front of it, there is no need to put it after the word. Hope that helped. Also, sorry no one responded to your question for a year. I hope you can see this.
Why can't it be 키가 큽니다?
I think 키가 is concerned with hieght
Wouldn't just 식당은 큽니다 be acceptable?
I beliege that would just be The restaurant is big. Adding "this" To it implies that this specific restaurant is big. Then again dont take my word this is just an assumption but it makes sense
No, since it's not specific enough. You need to put 이 before it to specify as "this" restaurant.