It is been years _________ I enjoyed myself so much as last night 这个为什么要用since 不用before?完全说不通啊.________ the protective glasses when you begin the experiment .please这个为什么要用wear?该用非谓语啊.

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It is been years _________ I enjoyed myself so much as last night 这个为什么要用since 不用before?完全说不通啊.________ the protective glasses when you begin the experiment .please这个为什么要用wear?该用非谓语啊.

It is been years _________ I enjoyed myself so much as last night 这个为什么要用since 不用before?完全说不通啊.________ the protective glasses when you begin the experiment .please这个为什么要用wear?该用非谓语啊.
It is been years _________ I enjoyed myself so much as last night 这个为什么要用since 不用before?完全说不通啊.
________ the protective glasses when you begin the experiment .please
这个为什么要用wear?该用非谓语啊.

It is been years _________ I enjoyed myself so much as last night 这个为什么要用since 不用before?完全说不通啊.________ the protective glasses when you begin the experiment .please这个为什么要用wear?该用非谓语啊.
1.应该是It has been,这里是完成时,一般before不跟完成搭配,这是第一点,第二点呢,since是自从的意思
句子的意思是 自从我像上次晚上玩的那么开心之后就已经很多年了,before是在……之前,用在这里说不通
2.这里是祈使句,祈使句,动词放在句首要用原形
当你开始做实验的时候,请带上防护眼镜

1 这里的It is been相当于It has been，如果用before意为在我昨晚之前已经有好几年没有享受了，此为过去的事情，应该用was
2这是个祈使句，就像我们常说的（please）sit down

第一句应该是It has been years since -------自从做某事以来已经多久了。 It has been years 结构 可以缩写成It's been years
第二句 前半句是祈使句 ，所以用动词原形

第一句 it is been 不对吧。 应该是 has 完成时所以用 since
的一个，你加上 (you should) wear the protective glasses when you begin the experiment .please
后面还有please 这是个祈使句，省略了前面的主语，所以需要谓语动词，而不是非谓语。

第一句是 It has吧？ 完成时since 自....以后
第二句 wear动词原型位于句首 因为这是一个祈使句 看后面的please

因为前半句是现在完成时，后半句是过去时，这是since的标准句型。before 的时态应该是前后一致的。
这是祈使句。

这句的意思应该是自。。。以来，昨晚我是玩的最开心的时候
“It’s / It has been + 一段时间 + since + 时间状语

先说第二句话，是祈使句，所以不用非谓语，就是“在实验开始之前请戴上防护镜”。
再说第一句，这句话本身就很有问题，years 肯定指的是 last night 之前的时间，也就是说我有好几年没有像昨晚那么开心了。
before“是在。。之前”，正常我们不这么用，而是用since，所以这句话的问题是在于 “it had been years” ，这样，时态才是对的。...

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先说第二句话，是祈使句，所以不用非谓语，就是“在实验开始之前请戴上防护镜”。
再说第一句，这句话本身就很有问题，years 肯定指的是 last night 之前的时间，也就是说我有好几年没有像昨晚那么开心了。
before“是在。。之前”，正常我们不这么用，而是用since，所以这句话的问题是在于 “it had been years” ，这样，时态才是对的。

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先说前一题中的意思是“自从那一晚我玩的开心后，已经有很多年了。”但是用before的话，那么就不符合题中的“It is been years ”的时态了。
后一题中主句与从句的主语相同所以主句中的主语省略you ，直接用wear开头。用非谓语的话，主句就不是一个完整的句子了。...

全部展开

先说前一题中的意思是“自从那一晚我玩的开心后，已经有很多年了。”但是用before的话，那么就不符合题中的“It is been years ”的时态了。
后一题中主句与从句的主语相同所以主句中的主语省略you ，直接用wear开头。用非谓语的话，主句就不是一个完整的句子了。

收起

第一个，应该是has been 吧，since,表示从何时到何时的“一段时间”，对应完成式has been，而before表示在某个时间点“之前”，它表示的是“点”，只能对应过去式。
第二个，祈使句，放在句首，用动词原形。

It ___ six years since I left school.空格填什么?It ___ six years since I left school.能填is,那has been 能不能填啊? It is been years的句子结构 It is said that it ___ here since hundreds of years ago Ahas been existed Bhas existed It is five years ___ Mr Wang ___ the car It ___ five years since he left for Beijing.A.was B.had been C.has been D.is going to be it is 3 years since Tom has been abroad he's been in Japan for six years.=it ___ six years ___ he came to Japan I have been here for three years.=It is three years ______I____here It has been ten years since I ___(be) a teacher. lucy has been away from hei home for three years等于 it's three years ______lucy ___ __________ her grandmather has been dead for two years同义句it ___ two years since her grandmather __ It ___ 6 years since we left middle school.A.was B.had been C.has been D.were it is two years since I came here还是it has been two years since I came here It is a reason ___ l have been waiting for for over ten years ,though I know it can be a made-up one.A.why B.for which C.what D.that 把理由讲一下, It is 3 years since he joined the army.为什么用is不用has been it was two years ago when i got to kown him(同义句） it is two years ___ ___ ___ __ __ him It was 85 years还是 it has been 85 years? 同义句my grandfather has been dead for five years it is five years ███ my grandfather