1) It is dificult to learn English. dificult là adj learn English là v

2)Learning english is difficult.

3)It was wonderful to see our friends again. Wonderful: adj; see: v

4)It is useless to Complain about that matter now. useless: adj; complain:v

5)It was very uncomfortable to sit in one place for so long. uncomfortable:adj;sit:v

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1. Learning english is difficult ----->it is difficult to learn english

2. It is diffcult to learn EL ----->Learning english is difficult

3. Seeing our friends again was wonderful ----->It was wonderful to see our friends again

4. Complain about that matter now is useless ----->It is uselessing to complain about that matter now

5. Sitting in one place for so long was very uncomfortable ------ It is very uncomfortable to sit in one place for so long