but these has not had any effectJasper has put up 'No Parking' signs outside his gate,but these have not had any effect.在这句话中,为什么前后都是完成时?后半句not had any 这个怎么理解?为什么还有一个had?

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butthesehasnothadanyeffectJasperhasputup''NoParking''signsoutsidehisgate,butthesehavenothadanyeffect.在

but these has not had any effectJasper has put up 'No Parking' signs outside his gate,but these have not had any effect.在这句话中,为什么前后都是完成时?后半句not had any 这个怎么理解?为什么还有一个had?
but these has not had any effect
Jasper has put up 'No Parking' signs outside his gate,but these have not had any effect.在这句话中,为什么前后都是完成时?后半句not had any 这个怎么理解?为什么还有一个had?

but these has not had any effectJasper has put up 'No Parking' signs outside his gate,but these have not had any effect.在这句话中,为什么前后都是完成时?后半句not had any 这个怎么理解?为什么还有一个had?
楼主的第一个问题：一个句子前后是可以使用同一个时态的,这表示前后两个动作同时发生或者可以没有时间的分别.
第二个问题：
1.首先要清楚,have的时态,现在时：have.过去分词：had.
2.现在完成时的表示：表肯定：has/have+动词过去分词 表否定：has/have+not +动词过去分词
3.句中have not had 是现在完成时.其实后半句有一个词组：have an/any effect (on)意思是有影响.”but these have not had any effect“中的“had"就是have an/any effect on中的have,只不过用了过去分词形式,也就是 have not had any effect它的结构其实就是：have+not+had any effect（现在完成时的否定）
所以楼主不能单单拆下“not had any "来分析.
例句：Smoking has had a bad effect on health (我自己造句的,希望楼楼别介意,\(≧▽≦)/~）
意思是：吸烟对健康有着不良影响（就是我们常说的：吸烟有害健康）

Jasper已经在他门外贴出了“禁止停车”的标志，但是这还没有起到任何效果。这是现在完成时，现在完成时有对现在动作的一个持续，也就是说因为尽管他已经贴了，但是现在还没有起到任何效果。

它们都强调事情到目前的发展状态，所以用现在完成时，这并没有语法错误，因为有but连接。至于后面的not had any ，其中not是否定词，had是have的过去分词，与后面的effect构成词组，译为有影响、效果，产生影响。若后面有宾语，用介词on

现在完成时的作用：表示以前发生的事或动作并持续到现在，并对现在有影响。
因为这件事是过去发生的，并且持续到现在，且对现在有影响，所以就用现在完成时啊

He has not had a night ___for two weeks ,but he still fell__中填a.off,happy b.away,happily c.off,ha what has legs,but can not walk Jasper has put up no parking signs outside his gate,but these have not had any effect.为什么前后两句都用完成时. but these has not had any effectJasper has put up 'No Parking' signs outside his gate,but these have not had any effect.在这句话中,为什么前后都是完成时?后半句not had any 这个怎么理解?为什么还有一个had? but,these books are not mine .急,马上就要 Jasper has put up no parking signs outside his gate,but these have not had any effect.Jasper has put up no parking signs outside his gate,but these have not had any effect.逗号前这句是什么时态?后面的这句应该是现在完成式的否 I'm disappointed in loveXiaoyan,I have not saw u for 58 days.in these days,i missed u every day.Do u know?i know u don't want to come back,but i expected u back day by day.Do u know i my heart is broken,but u don't care my feeling anymore.i know u ha 英语作业上不懂的地方,1根据句意和汉语的提示,写出正确的单词：1 This is _____(我的）jacket,but these shoes are not____(我的).2 That's not ________(他的） ball.It's__________(我们的）.3 Joe's cat is very cute.It ha what has four legs one back but can not walk? tom has a baseball,but he ( )(not have) a basaball What has a foot,but can not walk?还有没有？ what has an eye but can not see? What has a tongue but can not talk? What has 100 legs but can not walka broom (1/2)Is John coming by train?He should,but he＿＿not.Ha likes dri ok~but you not in my dream ,you aways when i surf the internet i can see you ha 英语翻译i could not deceive myself,i thought that i might not care about has occurred these matters,perhaps imight accept itself to do such matter,but i actually discover me not to beable nom,i make mistakes,but the matter had already occurred,i It has tow big eyes,but it can not see.It has two ears,but it can not hear.