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简介：
通常在原词后加n’t，若原词以n结尾，直接加’t。
1、系动词 + not：
isn’t = is not；
wasn’t = was not
aren’t = are not；
weren’t = were not
注意：am not一般不缩写。
2、助动词 + not：
don’t = do not
doesn’t = does not
didn’t = did not
haven’t = have not
hasn’t = has not
hadn’t = had not
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