we clapped our hands while they were marching across the park 为什么前面一定要用clapped,用were clapping 不对在哪里?

when he _____his wonderful speech ,we all stood up and clapped our hands.(conclusion) we clapped our hands while they were marching across the park 为什么前面一定要用clapped,用were clapping 不对在哪里? 怎样使用一般过去时在字典里的很多例句中看到,里面的动词是使用动词的过去式的,比如：We clapped our hands for the singer.那么,怎样去区分一般现在时和一般过时的句型呢? We usually write with our _____ hands. We must wash our hands befor m_____ We can touch and feei ( ) our hands 英语 用所给动词的适当形式填空. We all ---------(clap) hands when we saw Shenzhou VII launchinginto space.用clapped还是were clapping Children were seen _____ their hands and ___a song when I came into our classroom.A clapped;sangB clapping;singingC clap;singD to clap;sing fill in the blanks with the words in their proper forms.1.she told us the plan of her new project___.(brief)2.when he___his wonderful speech,we all stood up and clapped our hands.(conclusion)3.I am afraid you've made a wrong___.you'd better think it We （were clapping )our hands while they were singing on the stage.可不可以用clapped,我的理解是,鼓掌可以是短暂性动作,不一定唱歌的时候一直在鼓掌吧?while的主句动词不一定是be+V ed的形式吧如果帮我解决 we should wash our hands before we havewe should wash our hands before we have meals.同义句we should wash our hands后面两个横线填什么 英语同义句转换 we should wash our hands before we have meals.we should wash our hands ( ) ( ) We all write with our right hands 这是什么句型? We usually write with our ( ) hands.填单词 We should wash our hands b________meals.首字母填空 we have time on our hands什么意思 we should wash our hands before eating同义句we should wash our hands before ______ ______ We+have+54+bones+in+our+hands+and+26+bones+in+our+feet+的意思?