Hello!
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1. I usually play tennis on Saturdays.
2. I'm sorry I can't lend you my pen. I am using it myself at the moment.
3. The leaves fall from the trees in the autumn.
4. Exams are getting more and more difficult.
5. The Earth goes around the Sun.
6. Sue is using a friend's bicycle until her car is repaired.
7. I am doing my homework, so don't disturb me.