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怎样区分英语语法各种时态

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怎样区分英语语法各种时态
①be going to +不定式,表示将来.否定句或疑问句直接在be动词后加not或提到句首.
  a.主语的意图,即将做某事.What are you going to do tomorrow?
  b.计划,安排要发生的事.The play is going to be produced next month.
  c.有迹象要发生的事.Look at the dark clouds,there is going to be a storm.
  ②某些动词的进行时表示将来,通常表示按计划、安排即将发生的动作.
  常见的动词有:go,come,leave,start,arrive,return,spend,meet,fly等.
  The bus is coming.
  汽车来了.
  He is flying to Tibet tomorrow.他明天要飞往西藏.
  ③一些动词用一般现在时表示将来,但必须与未来的时间状语连用.
  常见的动词有egin,come,go,leave,sail,start,arrive,meet,return等.
  Class begins at 8:00 am.上午8点开始上课.
  We return to Italy tomorrow morning.
  我们明天上午返回意大利.
  ④be+动词不定式,表示安排、命令或预定要做的事情.
  Where are you to meet this evening?你们约定今晚在哪见面?
  ⑤be about to do sth.表示“即将做……”或“就要做……”
  I was about to leave home when the telephone began to ring.
  我正要离开家,电话铃突然响了.
  二、过去时的特殊用法
  1.wish,wonder,think,hope 等用过去时,作试探性的询问、请求、建议等.
  I thought you might have some.我以为你想要一些.
  2.用过去时表示现在,表示委婉语气.
  ①动词want,hope,wonder,think,intend 等.
  Did you want anything else?
  I wondered if you could help me.
  ②情态动词could,would.
  Could you lend me your bike?