9. Rewrite the sentences below using the present perfect tense. Use positive of negative forms.
1. My father stopped smoking two years ago. He still isn't smoking.
My father hasn't smoked for two years.
2. I brushed my teeth a few minutes ago.
3. My brother went to Britain two months ago. He is still there.
4. My leg is broken. I can't walk.
5. I didn't see a lion in my life.
6. I last saw my grandparents four months ago.
7. The scientists finally found a cure for the disease.

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