We were watching TV when the telephone rang. 里的We were watching TV when the telephone rang. 里的 when 为什么不可以换成 while ?

As we were watching TV,the postman arrived.求翻译 The telephone rang.We were watching TV.合并为一句We were watching TV ___ the telephone __. We were watching TV when the telephone rang. 里的We were watching TV when the telephone rang. 里的 when 为什么不可以换成 while ? We were watching TV ___ suddenly the light went out.填when还是 while?为什么? We realy liked watching TV(对watching TV提问) we like watching TV,too同义句 We enjoy watching TV.请问为什么watching要加ing We often watch TV还是 watches TV还是watching tv为什么那什么时候用watches TV 和 watching TV呢 were people TV watching at time yesterday this when we were watching it和while we were watching it哪个对,为什么? a.We were watching TV when we heard the door____b.We were watching TV when we heard someone____at the door(knock)老师说第一个是knocked,我认为不是heard do和heard doing么?这儿听到敲门完整是动作不是用do么?加上是被动,所 We ——（watch）TV when the phone rang. 应该怎么填（watched、were watching）为什么，拜托，快一点好么，我们明天就考试了 We were watching TV when suddenly there was a ____ on the window.A. tipB. tapC. lapD. sap选什么,为什么呢? We(are watching TV)(对括号里的部分提问) we each like watching TV.的同义句 So we should control the t of watching TV _____ you ______ TV at eight last night?A.Did,watch B.Were,watching C.Are,watching D.Do,watching We were going to go out,but-----watching TV at home because of rain.A took upWe were going to go out,but-----watching TV at home because of rain.A took up B came out C set out D ended up