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Hi,

When do you have to use singular and when plural in combinations?

This is a three students project / This is a three student project.
the three people / three person apartment
It's a two bedrooms / bedroom apartment.

I can never seem to get it right.

Paul
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Use singular when it is functioning as an adjective; use plural when it is functioning as a noun:

This is a three-student project.
the three-person apartment
It's a two-bedroom apartment.


This project requires 3 students.
The apartment is for 3 persons.
It has two bedrooms.
.
Comments  
Students: We have free audio pronunciation exercises.
1. It's a two-bedroom apartment.

2. It's a two-room apartment.

3. It's a two-roomed apartment.

I sometimes see 'two-roomed apartment', as in sentence 3. Is it correct?

Thanks a lot.
LissionI sometimes see 'two-roomed apartment', as in sentence 3. Is it correct?
I have never seen this usage. I guess it's possible that it's used in some specialized context but not in everyday speech.