Zhang Lin also put up some signs(ask)(for)old computer括号内的适当形式?为什么是asking?

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Zhang Lin also put up some signs(ask)(for)old computer括号内的适当形式?为什么是asking?

Zhang Lin also put up some signs(ask)(for)old computer括号内的适当形式?为什么是asking?
Zhang Lin also put up some signs(ask)(for)old computer括号内的适当形式?为什么是asking?

Zhang Lin also put up some signs(ask)(for)old computer括号内的适当形式?为什么是asking?
一个单句里不能有两个动词,即不能有两个谓语,所以前面已经有了一个put作为谓语动词,那么后面的ask就只能以to ask asking asked的形式出现,而此句中表达的是两个动作都是张林主动做的,表达一种伴随语态,所以是asking.

首先,此句中put已经做了谓语,不能再有谓语,ask肯定不行;其次,根据句义,ask和put这两个动作同时发生,故用现在分词形式asking做伴随状语。