1. If number of speakers decrease, some languages will be endangered. 2. If Internet reaches all corners of the world, English as the Net language will influence the culture of non-speaking countries. 3. If English keeps on being global, other languages won’t set foot on Internet. 4. The world’s linguistic experts will be alarmed if many languages disappear at an alarming rate. 5. If some tribes aren’t urbanized and assimilated into mainstream, their languages won’t die out. 6. Youngsters will be able to communicate with people from abroad, if they learn foreign languages. 7. If the EU wasn’t worried about endangered languages, they wouldn’t issue a special directive on preserving them. 8. If minority languages aren’t politically tolerated, they will be in jeopardy. 9. If the high number of languages spoken in the EU corridors, it would be like a Tower of Babel. 10. If English is the language of trade and diplomacy, it will be considered as lingua franca nowadays.
4 The lesson hadn't begun yet, and the children were talking loudly in the corridor. 5 I have lived in St. Petersburg since 1991. 6.By the fifteenth of January the students had passed all the examinations. 7. The students had written the paper by dinner-time. 8. They had been sailing down the river for many hours before they came to the village. 9. I haven't been to my home town for five years. 10. The rain had stopped by the time we reached home. 11. The message arrived five minutes after he had left the house.
1.Have you been?
I haven`t done.
2.I have never tried.
3.I have just received.
Has she been?
4.Have James and Lilly arrived?
They haven`t called.
5.Have you done?
We have flown.
We have taken.
6.I haven`t booked.
I have asked.