这里为什么要用进行时?Mean while,they should encourage those among us who can not swim five yards before they are gasping for air.我是想问为什么before后面一定要跟一个现在进行时呢?能跟现在进行时么?不好意思说

这里为什么要用进行时?Mean while,they should encourage those among us who can not swim five yards before they are gasping for air.我是想问为什么before后面一定要跟一个现在进行时呢?能跟现在进行时么?不好意思说 what dose she mean by'change'in the last sentence?mean是什么意思?为什么要用by,在这里起什么作用 Just then,The telephone rang.这里为什么用过去式啊,为什么不是过去进行时呢? Vacation means holiday 请问这里为什么是 means啊?为什么要加s 为什么不是 is mean ---What did you say?--So you were not listening to me.这里为什么要用过去进行时,而不是一般过去时? What's that noise?What (is happening)?请问这里happen为什么要用现在进行时呢? Lily's aunt often wearing a blue sweater and black trousers .这里的wear为什么要用进行时? I mean you’re not the only ones on your honeymoon 这里的ones是什么意思 为什么这么用 I mean there is no manufuring charges involved in this.这里的charge为什么用复数?前面不是is吗 Life is a candle meant to burn ever brighter为什么用meant to而不是meaning to 这里的mean是什么意思 well mean 为什么用这样的表达?不是mean well. what does it mean 的回答用现在进行时吗 用一般过去时和过去进行时完成句子1.She( )(see)the police car whileshe( )(drive)to work.2.I( )(make)the dinner when the telephone( )(ring).3.She( )(look)out of the window when she( )(see)the fire.4.The teacher( )(come)into the room whil I shall be attending the meeting.这里有shall了,为什么这里还要现在进行时? 现在进行时表将来为什么不用一般将来时比如说Mille's birthday is coming up这里是一个现在进行时吧?那为什么这个不用一般将来呢?是不是应为这是事先知道的，所以要这么用 mean现在进行时是不是+n再+ing? 狮子王里面的一句台词being brave doesn't mean you go looking for trouble.我想问 1：为什么要用being ,这是什么用法?2：brave在这里是什么词性?谢谢 pupils will be sending him a present to mark the occasion.这句话为什么这里要用将来进行时?起到什么作用呢?