Ex1:

1. is sitting - are talking

2. are running

3. is riding

4. aren't working

5. is swimming

Ex2:

1. leaves - is working

2. sleep

3. do

4. is working

5. am looking

Ex3:

1. I am wearing mask.

2. I am doing exercises.

3. I am cleaning my house now.

4. I am not hanging out with my friends at present.

5. I am not going out at the moment.

Giải thích các bước giải : 

Exercise 2 : 

1. Leaves ( simple present) / is working ( present continuos )

2. Sleep ( giữ nguyên do chủ từ là số nhiều ) 

3 . Do ( giữ nguyên ) 

4. Is working ( có at present ) 

5 . am looking ( do câu phía trước lá câu cảm thán ) 

        Exercise 1 : 

1. Is sitting / are talking ( có now )

2 . are running ( có at the moment ) 

3 .is riding ( có now )

4.  are not working ( có right now )

5. Is swimming ( có at the moment ) 

    Ex 3: 

1.I am updating the news about Covid-19

2. I am propagating the aftermath of Covid-19

3. I am restricting talk with my friends

4. I am wearing on a face mask

5. I am projecting my healthy actively.