We use 'remain' when someone or something does in one place or state without moving or changing. It means to stay as you are.
Please remain here until I return.
They remain at home all day long.
'Remain' means that some parts are still there even after others have gone. It shows what is left or not used.
Only a few books remain on the shelf.
Some food remains after the party.
In formal use, 'remain' means some parts or items are still there after others are gone or after an action. It can describe what is still to be done or answered.
Two seats remain for the concert.
Many questions remain after the meeting.
As a noun, 'remains' means the parts that are left from something, often from a destroyed or old thing, like buildings or bodies.
The remains of the old building are still visible.
They found the remains of the lost city.
'Remains' can also mean the bodies or parts of dead people or animals. It is often used in formal or scientific language.
The remains were buried in a cemetery.
Archaeologists discovered ancient human remains.
This use of 'remain' means to stay in a place when others have gone, often to finish work or for some purpose.
She remained after class to ask questions.
He remained at the office late today.
