精选优质文档-倾情为你奉上新概念英语第一册全部语法 (2008-05-07 13:50:35) 一时态:一般现在时,现在进行时,一般过去时,现在完成时,一般将来时,过去进行时,过去完成时,过去将来时1. 一般现在时 表示一般性,经常性的动作或一般性事实。usually, sometimes, always, often 等词在英文中被称为“频度副词”,是用来表示动作频率的,但程度上有别。一般来说可按频率大小排列:alwaysusuallyoftensometimesseldom(很少)hardly evernever(从不) 含有be动词的句子He is a teacher.The girl is very beautiful.Tim and Jack are students.变疑问句将be动词移到句首Is he a teacher?Is the girl very beautiful?Are Tim and Jack students?变否定句在be动词后面加notHe is not a teacher.The