现在完成时 have是助动词how long have you () it?应该是had为什么不是have

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• the company had about 20 notbook computers but only one- third __were______ used regularly.Now wethe company had about 20 notbook computers but only one- third __were______ used regularly.Now we have 60working all day long.为什么用过去时,不是regularly经常吗,我觉得应该是现在是
• How many of you 语法对么?在英语口语中 表达：您几位?/ 您几个人?的时候.看到有说 How many of you 这个句子 应该是正确的吧.1 How many of you many 后面一般不是修饰 可数名词么?这里的 many 没有修饰名词,是不是 many 这里是做代词的用法?2 How many people do you have / How many of you are there 这么说的话.都是可以的么.也是在网上看到的.
• -Have you eaten your breakfast?-Yes.I ___ (eat) just now.为什么是过去式而不是现在完成时啊?
• how long have you had to wait?had 如果是现在完成时,wait为什么不加ed,
• How long __ you __(从事)the project?为什么答案是have,been working on
• 1.---______ have you lived in Beijing?---Since 2000.A.When B.Why C.How long 可是我想知道A怎么不可以?我一直弄不懂when和since他们的区别啊!老弄混 希望帮我解释下!3.The heavy rain ______ me _______ the Great Wall last Friday.A.prevented; visiting B.stopped; to visit C.keep; from visiting 答案选的是A 我知道是选这个,但是c为什么不可以,他的句型也是对的,也有阻止某人做某事的意思哦
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• have是实义动词,在现在完成时里是助动词,这么说对吗?是不是只能在现在完成时里做助动词