The twins are singing in the room (at present).
I'm (three years younger)than his sister.
(It takes)Alex two hours (to) play sports every day.
(It )is very important for students (to exercise)every day.
The twins are singing in the room (at present).
I'm (three years younger)than his sister.
(It takes)Alex two hours (to) play sports every day.
(It )is very important for students (to exercise)every day.