20.is watching (chia HTTD vì có at the present (dấu hiệu của HTTD)

watches (chia htđ, nó chỉ đơn giản là chỉ thói quen)

21.is raning (chia httd, dấu hiệu now)

22.is (a sofa là số ít; be=>is)

23.isn't (chia như thường)/ is working (chia httd)

24.isn't going (tương lai gần)/ is staying

25.does,go / goes (chia HTĐ)

26.has

20. My brother is watching TV in the living room at present. He always watches TV in his free time.
Dấu hiệu nhận biết: at present, always
=> is watching / watches
21. We can't go out now. It is raining.
Dấu hiệu nhận biết: now
=> is raining
22. There is a sofa in front of the window.
Tạm dịch: Có một chiếc trường kỉ ở phía trước cửa sổ.
Present Simple
=> is
23. Lan is not in her room at the moment. She is working in the garden.
Dấu hiệu nhận biết: at the moment
=> is not / is working
24. She isn't going to the movie theater tomorrow evening. She is staying at home.
Tương lai gần -> Present Continuous
=> isn't going / is staying
25. How does she go to school every day? - She goes by bus.
Dấu hiệu nhận biết: every day
=> does she go / goes
26. Their house has a beautiful yard.
Tạm dịch: Ngôi nhà của họ có một cái sân tuyệt đẹp.
=> has
$#$ $We$ $are$ $doing$ $my$ $best$