с упражнением. очень нужно(
Replace the adverbial clauses of time by the Participle. Model: When you speak English, pay attention to the intonation. (When Speaking English, pay attention to the intonation.
1. Be careful when you cross a street.
2. When you leave the room, don't forget to switch off the light.
3. When you begin to work with the dictionary, don't forget my instructions.
4. When they were travelling in Central Africa, the explorers met many wild animals.
5. When you copy English texts, pay attention to the articles.
6. You must have much practice when you are learning to speak a foreign language.
2) If they hadn’t walked 40 km, they …would not have been (not / be) exhausted now.
3) What would have become of us, if I …would have come (come) to you then!'
4) He would have been scrupulous — if he (can) had been able to… !
5) What will be the answer if you (add) …add 17 to 75?
6) If he …practices (practice) every day, he …will become (become) a champion.
7) She …will help (help) us if we …ask (ask).
8) If you …had (have) a driving license, you …would get (get) this job.
9) My dog …would (be) 20 years old today if it …were (be) alive.
10) I … would have visited (visit) Sarah yesterday if I …had known (know) that she was ill.