Select the correct tense form for the given sentence.
They are playing for an hour.
1. They have been playing for an hour.
2. They are playing since two hours.
3. They are playing.
4. None of these.
Select the correct tense form for the given sentence.
They are playing for an hour.
1. They have been playing for an hour.
2. They are playing since two hours.
3. They are playing.
4. None of these.