小的英语语法问题,请求解!we put up a sign reading "."和 we set up a sign which read"."为什么一个用reading而一个句子用read?

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小的英语语法问题,请求解!we put up a sign reading
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小的英语语法问题,请求解!we put up a sign reading "."和 we set up a sign which read"."为什么一个用reading而一个句子用read?
小的英语语法问题,请求解!
we put up a sign reading "."和 we set up a sign which read"."
为什么一个用reading而一个句子用read?

小的英语语法问题,请求解!we put up a sign reading "."和 we set up a sign which read"."为什么一个用reading而一个句子用read?
reading...属于现在分词短语作定语,修饰前面的名词a sign
而第二个句子在read的前面有个which,这是定语从句的引导词,有了这个词,后面不能用reading,而应用谓语动词read.
再如:The desk standing there.
The desk which stands tehre.

we set up a sign which read是一定语从句, which read······是修饰sign
we put up a sign reading没有用到关系代词which,而此句又为一复合句,因而用到非谓语动词reading来引导定语从句

reading是现在分词作定语,不用考虑时态。
which read.. 定语从句, 动词要考虑时态, read是过去式