1. Write about your travel experiences, using have/has gone, have/has been, for and since.
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英语语法的时态有哪些：现在完成进行时have been doing例句
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2. Since the end of the SARS epidemic, scientists have been doing trials on treatments to prevent any future outbreaks.
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3. Some advice has been given for people to help ____ 4____, for example, using public transport or ____ 5____, doing your shopping in the shop just around the corner instead of driving to the other side of town.
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4. Grandma has been complaining about the vegetables sold in the supermarket, which have been grown using chemical fertilisers.
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5. Still, as has been already said, other things affect the result considerably, owing to the defects of our hearers.
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6. Recently, there has been an increase in the number of mature students going to university, after working for a few or many years.
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7. You learn from a TV report that Student B's city has been suffering from rainstorms and floods.
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8. Given these cultural differences, it comes as no surprise that Canada has been celebrating Multiculturalism Day since 2002.
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