常与现在完成时连用的单词都有哪些_高中英语语法

常与现在完成时连用的单词都有哪些

一、since不管since 是用作介词、连词还是副词，它通常都与现在完成时连用。如：Charles has worked hard since leaving school. 自从离开学校以来查尔斯工作一直很努力。(since为介词) Great changes have taken place here since 1978. 自1978年以来这里发生了巨大的变化。(since为介词)Her reading has improved greatly since she changed schools. 自从她转校以来，她的阅读水平提高了很多。(since为连词) You haven’t changed muchfy; mso-char-indent-count: 2.0; mso-char-indent-s since we last met. 自从上次我们见面以来，你变化不大。(since为连词) She moved to London last May and has since got a job on a newspaper. 她去年五月到伦敦，此后一直在报社工作。(since为副词) He left school in 1983. I haven’t seen him since. 他1983年离开学校。打那时起我一直没见过他。(since为副词)

【几点说明】1. 表示时间长度时，通常用一般现在时代替现在完成时。如：How long is it since you arrived? 你到来多久了?It is [=has been] ten years since he left here. 他离开这儿已10年了。2. 对于某些表示状态(如seem等)的动词，或因句义等方面的原因，有时可能用一般现在时比用现在完成时更合适。如：It seems like years since we last met. 我们似乎几年未见面了。 Since when does the $42 plus $5 service charge come to $48? 从什么什候开始42元加5元的服务费等于48元了? 3. 若不是指从过去持续到现在，而是指从较远的过去持续到一个较近的过去，则用过去完成时。比较：He hasn’t eaten anything since Tuesday. 自星期二以来他一直未吃东西。(自星期二以来他一直未吃东西。指从星期二到现在未吃东西)Yesterday he told me that he hadn’t eaten anything since Tuesday. 他昨天告诉我自星期二以来他一直未吃任何东西。(指从星期二至昨天未吃东西