is open为什么不用现在进行时the library is open every day except Sunday中的open为什么不用现在进行时急

is open为什么不用现在进行时the library is open every day except Sunday中的open为什么不用现在进行时急 什么是一般现在时?什么是现在进行时?区别是什么?例如:Open your book 为什么不用现在进行时? the shop is open on sunday 为什么不用被动. The letter _____ open on his desk.(lie)现在进行时可以吗?is lying? 1.It's ten o'clock now.I think the shop is open.2.It's seven o'clock.The train is leaving.这两句 都是现在进行时么?为什么第二句就用is leaving呢?而第一句不用is opening呢? 改为现在进行时1Danny, open the door The sumpermaket (is open ) from 9am.To 9 pm every day.为什么要用is open不用open可是open的过去分词不是opened吗？ Jack is helping his mother clean the house.为啥要用现在时搞错了,为什么用进行不用现在时,为啥clean用原形 The shop ______(open)at five in the moring 为什么用opens不用is opened 为什么这家商店正在开放的英文中open不用加ing (the shop is open.) the weather is getting warm.为什么用进行时?为什么不用一般现在时呢? 现在进行时,open要双写n吗? The door is open.Who has opened(open)it?Sorry,I don't know.为什么用一般现在 could you please open the door为什么用open 而不用to open ,opening?谢谢! the door opened为什么不用被动语态?the door opened等于the door is open么?翻译起来一样么？ 帮忙看看这个七年级英语改错题 someone is open the window开窗户是持续性动词吗？可以用现在进行时啊？ look,the door is open,为什么open不加ing? Open the window.（用He做主语改为现在进行时）