#3. This is singular as is group, a collective noun. The group it does help, is helping, helps.
These is plural so it would have to be "These groups"
Sra
1. This is a group of students who help the sick.
2. These are a group of students who help the sick.
3. This is a group of students who helps the sick.
4. These are a group of students who helps the sick.
(Which expressions are correct? Please focus on 'this' and 'help. Is 'group' a collective noun? Thank you.)
2 answers
1. This is a group of students who help the sick. OK
2. These are groups of students who help the sick.
3. This is a group of students who helps the sick. OK
4. These are groups of students who help the sick.
2. These are groups of students who help the sick.
3. This is a group of students who helps the sick. OK
4. These are groups of students who help the sick.