语法是英语学习过程中最难掌握的知识，要想提高自己的英语学习效率，积累和掌握很重要。下面是关于英语时态知识，大家可以作为学习的参考。
【基本用法】 “过发现影”--- 表示过去发生，对现在造成了影响。
e.g. Their parents have known the good news.They look excited.
“过发持续”--- 表示从过去开始，持续到现在的动作或状态。
e.g. I have learned English for 10 years.
“经历” --- 表示曾经做过某事，或曾做过n次
e.g. I have seen the film Titannic twice.
【时间状语】 already, just, yet, since, since then, for, recently / lately,
so far = till / until now = up to now, in the last / past few years,
How long…ever, never, before, once, …times
【重难点】 延续性与非延续性动词的用法
什么时候才必须用延续性动词? 出现how long, for+时间段, since+时间点
非延续性动词转化
▲ 高频考点
borrow → keep buy → have
finish / end → be over begin / start → be on
open → be open die → be dead
join → be in / be a…member leave →be away(from)
▲ 需了解记忆
get up → be up fall asleep → be asleep
fall ill → be ill, lose → be lost
become → be return / come back / get back → be back
close → be closed catch / get a cold → have a cold
arrive /come / go / move / reach /get to → be in /at / be here /be there
【易错点】 in the past few years (不是 a few)
have been to, have gone to和have been in的区别
already与yet区别
since+时间点，for+时间段(since 3 years ago; for 3 years)
since 引导的从句要用一般过去时
It is /has been + 时间段 + since + 从句(一般过去时)
He came to our school in 2000, since then he has taught English here.
学好英语并非三两天的事，在学习的过程中掌握方法可以有效提高学习效率。