I wonder since when it has been like this,为什么since后的那个句子是用完成式-myfoot hurts terribly,doctor.-I wonder since when it has been like this?since后都是加时间点,也就是过去式,可是为什么这里的since后加的句

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I wonder since when it has been like this,为什么since后的那个句子是用完成式-myfoot hurts terribly,doctor.-I wonder since when it has been like this?since后都是加时间点,也就是过去式,可是为什么这里的since后加的句
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I wonder since when it has been like this,为什么since后的那个句子是用完成式-myfoot hurts terribly,doctor.-I wonder since when it has been like this?since后都是加时间点,也就是过去式,可是为什么这里的since后加的句
I wonder since when it has been like this,为什么since后的那个句子是用完成式
-myfoot hurts terribly,doctor.
-I wonder since when it has been like this?
since后都是加时间点,也就是过去式,可是为什么这里的since后加的句子是完成时呢?
我认为since是个介词,所以后面的所有都是做since的宾语从句呀,可是为什么会是完成时呢?

I wonder since when it has been like this,为什么since后的那个句子是用完成式-myfoot hurts terribly,doctor.-I wonder since when it has been like this?since后都是加时间点,也就是过去式,可是为什么这里的since后加的句
你的知识点掌握的很好,但你理解错了
他问的是since when 而不是since it has been like this
将这个一般疑问句转化成陈述句就是
since I dropped fom the bed yesterday（用这个答案代替when） it has been like this
有疑问可追问

此处你的理解错了。Since when has it been like this? 原句的意思是“我想知道从什么时候开始，它像现在这样子的。”完整问答一下就知道了：如 Since last year, it has been like this.
希望能帮到你。

后面是宾语从句，担不是since的，而是wonder这个动词的宾语，
since加时间，句子就是用完成时，for+一段时间，这些都是用完成时态
比如I have lived here since last year.

这个句子中，wonder后面是宾语从句，所以since when作为宾语从句的引导词，it has been like this是宾语从句的主句。
至于since引导的状语从句主句用什么时态，这跟要表达的意思有关，可以是过去时，也可以是完成时。比如
I haven't heard from him since he lived there.
和I haven’t hear...

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这个句子中，wonder后面是宾语从句，所以since when作为宾语从句的引导词，it has been like this是宾语从句的主句。
至于since引导的状语从句主句用什么时态，这跟要表达的意思有关，可以是过去时，也可以是完成时。比如
I haven't heard from him since he lived there.
和I haven’t heard from him since he has lived there.这两个句子意思是完全相反的。
前一句是表示：自从他不住那儿以后我再也没收到过他任何消息。（过去时表示动作的终止）
后一句表示：自从他住那儿以后我再也没收到过他任何消息。（完成时表示动作的持续）

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I wonder since when it has been like this,为什么since后的那个句子是用完成式-myfoot hurts terribly,doctor.-I wonder since when it has been like this?since后都是加时间点,也就是过去式,可是为什么这里的since后加的句 I wonder when your fruit will I wonder when I can get your reply I wonder when she will be back成分划分 wonder,when,I,visit,engineer,to the连词成句 I wonder who you are when you with he? I wonder when the telephone was ____ 中文 I want to know when we will start.改为同义句I wonder when ______ ______. since when i wonder why 的WONDER when you come and I am filled with wonder,Sometimes,I think I glimpse eternity. i wonder when i told u i love u,it is so strange翻译中文? i wonder when i told u i love u,it is so strang... 1.Water will continue to be ____ it is today----next to oxygen in importance.A.how B.asANSWER:A2.--My foot hurts terribly ,doctor.--Well,I wonder ____ it has been like this.A.since when B.since thenANSWER:B 1.It_______(snow)all day.I wonder when it will stop.2.So far we_______(have)3 major snowstorms this winter.3.When I showed him what I__________(write）,we said it was very good.4.She said that she had made much progress since she_____(come)here.5.Ho ____have you been travelling?since i was a boy.A Since when B When C for when 选择哪一个,为什么 _did you start riding?_ I was eight years old.when,when?when,since?为什么 it has been rained all morning. I wonder when it will stop.(有什么要更改)