英语翻译When the camera is functioning properly,a green light co

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英语翻译
When the camera is functioning properly,a green light comes on.为什么要用is functioning,为什么不用原型function
可是如果填空的时候没有is呢？不是你说的那个意思哦。就是说如果填空题是这样的When the camera （）properly,a green light comes on.这个空自己填的。

其实是一班现在时和正在进行时的区别,楼主要跟后面那句联系起来考虑---绿灯就亮了.
这句想表达的是相机正常使用时,就亮了.意思中含有正常工作和绿灯亮了同时进行的含义.
如果要用 When the camera functions properly,后面那句就应该是a green light is on.
其实真的要按照楼主的说法的话,也是可以的.英文到后面很多到后面都是凭语感的,如果不是为了考试,可以不用纠结这个的.

英语翻译When the camera is functioning properly,a green light co When the light is ____,you must wait at the crossing.A、green Go _(穿过)the street when the light is green go a_______ the street when the light is green 87 ___(cross) the road when the light is green What can she do when the light is green? When there is a green light,cars may go on.When there is a r when the light is green,you can walk across the road _____ ( Go a___ the stree when the light is green.how do you a___ at 英语翻译When a GPS antenna is installed near seaside properly,it when the light is red The light is green.Please walk ( ) the road.A.cross B.to C.a