Have/has been 后一定要加doing sth.吗?

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• 现在完成时中一定要加have/has吗?看到一个填空：They already _____(leave).怎么填?
• Have/has been 后一定要加doing sth.吗?
• by doing sth.可以省略by吗?Many vaccines are made using genetic modification.这里made后跟了一个using,事实上,using前是否应该有个by呢?这个是一个什么语法现象呢?好像还没解释到这里为什么made后可以加doing吧~还可以用其它方法来表达这句吗?
• never before 的疑问1.Never before has the city been in greater need of modern public transport than it is today.2.Never before has our country been as powerful as it is today.3.never before have so many people in the united states been out of work as today.这三个句子都是表示以前和现在的比较,有NEVER 引起的倒装.可是有三点疑问：第一句可否在than 后加what?,同时可否在第二句as加上what?.还有就是第三句可否把as today 改成as it is today?
• 英语现在完成时语法been英语现在完成时 has/have + 过去分词1 请问been是什么意思?2 什么情况下要加been?3 been后的动词是否用原型?请逐一回答,特别是第二问.
• 1、Mr Ford still loves the young lady ____he met at the railway station ten years ago.A.where B.who C.when D.there为什么不选C呢?2、The book was written in 1946,_____the education system has witnessed great changesA.when B.during when C.since then D.since when为什么要加since?A不可以吗?3、They asked me to have a drink with them.I said it was 9 years since I ___ a good drink.A.enjoyed B.was enjoying C.had enjoyed D.had been enjoying 为什么选C不选A?第一题选项打错了，应该是：A、that B.where Cw
• ★:一定要有步骤或语法思路等1\After learning Unit 7,we went on _______Unit 8.A.to learn B.learn C.with learn D.learning关于此题:本人选的答案是D,不是有个词组是Go on doing (sth.但正确答案上是A2\There going to have 和 There going to be 的区别3\There be...动词4\some time sometime sometimes some times 的区别（要求形象,便于记忆,或举例）5\It's too_____in the train to get on.A.crowd B.crowded C.crowding D.to crowd关于此题：本人认为too...to 的句型,too的后面加的应该是,但正确答案里是B请尽快解答,期末考即将来临.回答满意的话酌情追加赏分.
• 根据固定结构go to see the movies,写“我喜欢看电影”能写成”I like to see the movies.还是必须改为I like to watch the movies 或 I like watching the movies。另外，watch see 后搭配movies一定要用the吗？如果把I like to see the movies改为like doing sth.结构怎么改。
• 有3道英语选择题.1.If you plant watermelon seeds in the spring ,you( )fresh watermelon in the fall.A.eat B.would eat C.have eaten D.will be eating为什么不能选B啊?是不是后面不能用would那种的?2.For many years,people( )electric cars .However,making them has been more difficult than predicted.A.had dreamed of B.have dreamed ofC.dreamed of D.dream of这题为什么不选C啊?为什么一定要在前面加一个have?3.The traffic rule says young children under the age of four and ( )less than 40pounds must be in a child s
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