the bus stops,let's_____?a.get off it b.get it off 说明理由!能否回答的更详细，我想知道为什么一些短语代词只可放中间，而一些只可放末尾？

the bus stops at the bus stop 的意思 The bus stops.Let's___one by one.A.get on it B.get off it C.get it on D.get it off （说一下原因） The bus stops.let's_______one by one.A get on it B get it off C get out of it Dget it on Look,the bus( )(stop)填stops还是is. stopping? Get on the bus when it stops.(变为否定句) let's_（go）to the cinema now Please get off the bus after it stops.(改为同义句)Please ____________get off the bus _____________it stops Let the old 什么 the bus first. Let the old man( ) the bus first Don't get off the bus until it stops.能不能换成Don't get out of the bus until it stops. the bus stops,let's_____?a.get off it b.get it off 说明理由!能否回答的更详细，我想知道为什么一些短语代词只可放中间，而一些只可放末尾？ the bus stops are_the road on the rightat in along on 选哪个,为什么 按首字母提示填空：lets piay s_ Ann,The child often_(wanch)TV in the 1.Wait ( ) me out where.2.The bus stops ( ) the bus stop.3.I got up ( ) 6 o'clock. The bus is coming.let's( ). the No.15 bus stops here新目标英语八年级下册Unit10,Section A,Grammar Focus 里面有这样一句话：The No.15 bus stops here,doesn't it?为什么是stops?掉了一个撇号么? Don't get off the bus until it __.(.A.stop B.stops) Don't get off the bus until it stops.怎么改