1. It is difficult to learn English.

2. To jog in the morning is a good exercise. ( mình nghĩ là" jogging" thay vì "to jog")

3. It's wonderful to see our friends again.

4. It's not useless to complain about that matter.

(hoặc: It's not worth complaining ... )

5. It's very uncomfortable sitting in one place for so long.

6. It's a lot of fun to go to that party next week.

7. It's impossible to find example of that. 

8. It's(It will be) very interesting to travel to BLV island by boat

                                                                     Best regards, 

                                                                      dphkhng95

=>
1. It's difficult to learn English.
2. To jog in the moring is good exercise.
3. It's wonderful to see our friends again.

4.  It's useless to complain about that matter now.
5. It's very comfortable to sit in one place for so long.
6. It's fun to go to that party next week.
7. It's impossible to find example of that.
8. It's very interesting to travel to Bach Long Vi Island by boat.