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EX 3. Rewrite the first sentence so that the second one means nearly the same as the first one.
1. We started doing researches on this chemical three months ago.
-We have...
2. He began growing this kind of plant five months ago.
- He has ...
3. He has been collecting stamps for five years.
He started.
4. She hasn't gone out with him for 5 months.
→ The last time . .
5.We haven't seen such a cruel mother before.
> This is the first .
6.It's two years since we last saw Mr. Jones.
→ We haven't.
7.This is the first time I have visited the USA.
→I haven't.
8.I have learnt English for 10 years now.
→I began