14. The number of the population was decreased in the 1990 to 1995, the figure of population was increased in the years of 1996 and 2000, the data was then continue increas...
We can also use 'used to' in the negative form. We just add 'did not' or 'didn't'. Using our first example, we could say, 'I didn't use toplay football.'But be careful, with negative and qustion forms, we don't include 'd' at the end of 'use'.用法...
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