为什么不when were eat dinner而是when did eat dinner

为什么不when were eat dinner而是when did eat dinner 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 ? 为什么不能用were? when the guest arrived.we were having our supper.为什么不能用as soon as连接 The fans clapped with joy when they saw the stars.这里为什么不填were clapping? he were sleeping when the UFO arrived.为什么用were 为什么选C不选D I might eat an apple ______________.为什么选C不选DI might eat an apple ______________.A.occasional B.now and there C.once in a while D.from the time to the time people could eat the apples when there were no other fruits 翻译 9.I watch TV when I eat.(一般疑问句) 10.Both diets were unhealthy.(一般疑问句) If I were you,I·d eat nuts instead.为什么用were而不是am? Gone _________ when we were poorA are the days B were there days为什么选择A呢? 不因为是过去时吗? 怎么翻译 When the teacher came in,he found all the students_____(read).答案were reading ,为什么不能用reading _____ you _____(write) a letter when your mother came in ?第一个空是填were,可我不知道为什么. We were swimming in the river ____ suddenly the rain started.为什么这里填when不可以while? when we were having maths class,the door opened and in came astranger__our class(interrupting)为什么不填interrupted? ancient china was also a time there were many great thinkers处为什么只能填when,那as不行吗 when is she going to eat?为什么用is 不用does?eat 不是动词么? When were you born?为什么不是when were your born应该是你的生日啊?