The library is now closed.The library was closed.The library is closed.这三个句子有什么不同啊三个句子的意义和语法有什么不同啊?语法有什么区别啊？

-Where is Tom? -He ( ? ) to the library just now.A.goes B.went C.is going IS the library on the secod floor?是 where is the library?Is the library open now?what time si it?when is the library open?什么 意思？ 完成句子 The building______（build）now is our library. jim in the library,i saw him there just now.A maybe B may be C might is —Is the library ________ now?--No,it’s ________.A open;close B opening;closing C open;closed D Su Yang is cleaning the library now.将now换成often -Is Jack in the library?-Maybe.I saw him ______-Is Jack in the library?-Maybe.I saw him ______ out with some books just now.A.going.B.go.C.to go.D.went. Where is the library? Where is the library? -Is Jack in the library ? -Maybe.I saw him( )out with some books just now.A. going B. go C. to goD.went My father is not here,he went to the library now的同义句 i'm (无疑的) that Mary is in the library now The library is on the I saw Mr.Wang_____into the library just now A.went B.goes C.going D.go Maria is the library,填空 -IS jack in the library? Is that the library是什么意思 The library is now closed.The library was closed.The library is closed.这三个句子有什么不同啊三个句子的意义和语法有什么不同啊?语法有什么区别啊？