Unit 10 I've had this bike for three years.八年级 英语与练习单元语法 现在完成时表示从过去某一时刻延续到现在的动作或状态，与for，since引导的时间状语连用。for＋一时间，since＋过去时间点或从句(从句的谓语动词用过去式)。I have lived here for twenty years.我住在这里已有20年了。We have built many factories since 1985.自1985年以来，我们建了多工厂。He has always helped me with my English since he came here.自从他到这里以后，他总是帮助我学习英语。 有的动词所表示的动作不是瞬间就可以完成的，要持续一时间，这样的动词叫延续性动词。不能延续下去的动词，叫非延续性动词或瞬间动词。如：buy，borrow等，这些动词在完成时中可改为相应的表示延续性的词或短语来与表示一时间的状语连用。如：buy→have，borrow→keep，come→be，join→be，die→be dead，begin→be on等。 He joined the army two years ago.他两年前就参军了。＝He has been in the army for two years.他在部队已经两年了。＝He has been a soldier for two years.他成为一名战士已经两年了。根据句意，选用for或since完成句子。1．I've known him four years.2．We've lived here I was a child.3．She's waited for him twenty-five minutes.4．They've been married 1988.5．It's been three years I left my hometown.forsinceforsincesince知识点拨?scarf可数名词，意为“围巾”。其复数形式为scarves或scarfs。?Jeff has had his bike for more than 10 years.夫买这辆自行车10多年了。此句属现在完成时，buy是短暂性动词，不能用表示时间的完成时，应变为have。现在完成时中有时间状语时，应将这类短暂性动词转换为延续性动词。The play Cat has |
