These trees were planted last year.变成否定句They weren't planted last year.为什么these trees 要用they

These trees were planted last year.变成否定句They weren't planted last year.为什么these trees 要用they
英语人气:617 ℃时间:2019-08-21 22:12:05
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these trees 改成they是因为上下文为了避免重复用相同的词these trees而用they的,而单纯从一个句子改成否定句是不用改成they的.
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