listen这个词的过去式是listened,为什么不是listenned?

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• she has taken care of your daughter since you are away这句话我觉得有问题.本题是个选择题,答案是选since,如上面写的,据我了解,since不是跟完成时联用吗?就本题而言,如果选since,后面该是过去式啊,为什么是一般现在时.
• 动词relax 的过去式是relaxed .为什么不双写x,再加ed?这不是“辅元辅”结尾的重读闭音节吗?
• This is a photo i took during my trip to japen这话是新概念上面的意思是：这是我到日本旅行时拍的照片.那个TOOK不是take的过去式吗,在这句话为什么要有它呢?i shaved it off when i came home.意思是我回到家就把它（胡子）刮掉了.请问 when干嘛会出现呢,那是不是在这里 TOOK 就是表示去的意思呢
• 新概念第二册同步测试选择题.1:This is the first time__here为什么是现在完成时,不能是过去式吗.2：He has never spent a __day 为什么是more worrying 不是most worring.3:this news sounds__]怎么是encouraging 不是to encourage.4:i'd like to have this package__.madam怎么是 weighed,不是be weighed 5:__anything about the accident.是not knowing 为什么不是not know6:it__be my uncle.he has gone to beijing.是can't 为什么不是mustn't还有：he likes borrowing money from his friend.有两个动词怎么搞的.麻烦下了.
• 1.It's cold outside.Please keep the door closed.这里的为什么是closed,用过去式,而不是原型?
• This is a photo i took during my trip to japen这话是新概念上面的意思是：这是我到日本旅行时拍的照片.那个TOOK不是take的过去式吗,在这句话为什么要有它呢?TOOK在这里是不是去的意思呢?i shaved it off when i came home.意思是我回到家就把它（胡子）刮掉了.请问 when干嘛会出现呢,
• The girl is often listened to_songs in the next room.A.practise to sing B.practise singing C.to practise to sing Dto practise singing选什么啊?为什么是不是有listen to sb to do这个词组?
• 英语语法宾语从句问题.老师说,宾语从句前面的谓语如果是什么rely on ,depend on如果加宾语从句,一般要加it.请问这个是什么语法现象O O为什么要加it?是不是只有that引导的时候才加,如果换成what等引导的宾语从句是不是就不用it了.谢谢!~求例句.~请不要复制.简洁的语言告诉我吧..谢谢!是不是因为that这个词只有在expect,but,besides,in这几个介词后面直接引导宾语从句,而对于其他介词如果要用that引导宾语从句就要加it?it在这里是个什么成分.谢谢!
• 麻烦帮我解释一下这句英文句子中的两个语法问题是高一第一单元的一句话：I can well remember that there was a time when a deep blue sky,the song of the birds,moonlight and flowers could never have kept me soellbound.1.为什么要用“could”这个情态动词的过去式和一般过去时连用,而不是说成could never keep me呢?2.记得keep的用法是keep sb.doing sth.或是keep加上形容词,这里为什么用的是keep加上动词过去式呢?（麻烦不要用宾语啦、宾语补足语啦之类的解释,最好能通俗点,因为听同学给我解释了一遍,几乎听不懂,初中的时候没太学语法,尤其对补足语之类的很是不理解,
• 关于concern这个词1.(不用被动语态)关于2.涉及,关系到;影响到The letter is chiefly concerned with export commodities.这封信主要是关于出口商品的.以上是百度摘过来的 .不是说没有被动么 .那它在做涉及的时候是被动语态吗.为什么用被动 被涉及到?
• air的过去式
• cleaned needed rowed danced cooked listened wanted watched helped learned 归类结尾ed的发音相同那 cleaned needed rowed danced cooked listened wanted watched helped learned 归类结尾ed的发音相同的单词, 分成这几类. piayed一类 washed 一类 visited一类 把单词写在相应的单词框中. ------hiking with last weekend?横线上怎么填回答是I went with my friends一共有两个问题