这句话中的talk为什么不用过去时?There he heard an astronaut,Bob,talk about his journey.

这句话中的talk为什么不用过去时?There he heard an astronaut,Bob,talk about his journey. 为什么不用过去时 She watched TV until her mother came back.这句话为什么前面不用过去进行时? She watched TV until her mother came back.这句话为什么前面不用过去进行时? 为什么不用过去时?I haven't summoned you here for apologies.我不是叫你来道歉的.这句话为什么用现在完成时,不用过去时. all men are created equal 中的created是形容词还是过去分词?如果是过去分词,为什么不用不用equally?如果是形容词,为什么会有两个形容词呢?这句话出自《圣经》和《独立宣言》 英语翻译为什么不用过去时 The lights went out just as we entered the cinema.这句话为什么不用过去进行时? 这句话的条件句为什么不用过去时?If dinosaurs still exist on earth ,how could a man survival? talk的过去时 He will go back to his parents,because he left home for too long这句话中leave为什么用过去时?为什么不用一般现在时呢? 英语时态：I wanted to know when they would go to see the great wall为什么这句话的从句用一般现在时,不用过去时? When I looked out of the window,I saw(see)some birds.这句话不是过去进行时吗?为什么不用seeing而用saw? dare用法问题在He dared me to jump over the river.这句话里 没有过去时 为什么不用dares? 这句话的will为什么不用过去时?Dr Qian died in October,2009 and will be remembered by the world If there were a heavy snow next Sunday,we would not go skating.这句话为什么要用were不用was?was不是过去时么 我是想问a heavy snow貌似是单数 为什么不用was She and her family hid away for nearly five years before they were discovered为什么不用过去完成时这句话不是过去的过去吗? 帮我看看这两句话,谢谢.1 late in the afternoon,the boys put up their tent in the middle of a field.2 the boys felt tired so they put out the fire and crept into their tent.这两句中的put,为什么都用原型啊?为什么不用过去时