it has been a long time since+?since后面加什么形式?

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• it has been a long time since+?since后面加什么形式?
• 关于has been用法has been 是表示现在完成进行时,一般是have/has been+动词-ing.The door has been locked.这是格式怎么理解,我的意思是has been 后面应该是加动词+ing,为什么是加ed形式，就是这点不解。
• It has been a long time since anything as good as you has happened in my life的中文意思是什么?
• 用所给词的适当形式填空,请说明原因1、Would you like something to drink-Yes,some__(orange),please2、These days I have been much__(busy)than before33、China has__(success)sent up many man-made satelites to the space4、Teachers are__(need) by the children in the countryside5、It is long time since we__(meet)last time6、We should pay special attention to the__(spell)of these words7、I met people from different companies and wrote down their telephone__(number)
• 有6题有关for及since用法,帮我看一下好吗?1.She has studies English 【for】three years .2.He has been at the hotel 【since】yesterday .3.She has lived in Brazil 【for】a long time .4.He has taught Italian 【since】last September .5.He has had a cold 【for】four days .6.They have been friends 【since】six years.这是我自己写的,不确定是否正确 = =可不可以加一个翻译,顺便告诉我 我写的对不对呢?!呵呵,不好意思,我英文很烂 ...
• 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?
• how long后面要加什么动词?问题补充：how long 后面的动词一定是延续型动词吗?比如要用 How long has he been away from China?而不是How long has he left China?
• 几道英语时态题,4.clint woke up in the middle of last night .he was frightened and didn't know where he was.he(had been dreaming)7.we were good friends.we (had knowed) each other for a long time.9.yesterday i saw leon sitting on the ground.he was out of breath.he (had been running)为什么要用这些时态啊22.he ( ) several novels since 1985.most of them ( ) quite successful,but the last one ( )very good reviews.A has written/were/hasn't gotB wrote/have been/didn't getC has
• how long have you been studying为什么后面要加ing我可以说i have been studied since ...为什么?那应该怎么写?想题目上的问句是问说你到目前为止学了多久的英文还是问你学了多久的英文（已经学好）那we have been married for ...这个又是什么句型.
• It has been a long time since anything as good as you has happened in my life的中文意思是什么?
• 求歌词：it s been a long time since we drank the arsenic
• I think it's been a long time since I've heard anyone as good.语法讲解