现在完成时的标志词及用法

1、定义：1.过去发生的动作对现在有影响

例如:She has cut her hair.

2.动作从过去延续到现在，可能还要持续下去

例如：He has worked here for 5 months.

2、标志词：

already（肯定）

yet（否定/ 疑问）

just, before, recently, still, lately, never, ever, never, twice

on several occasion

in the past/ last few days/ weeks/ months/ years

(up to) these few days/ weeks/ months/ years

this morning/ week/ month/ year

up to present/ now

so far

till now

since + 时间

3、肯定句：

He/she/it+has+过去分词

You/We/They+have+过去分词

否定句：

He/she/it+hasn't+过去分词

You/We/They+haven't+过去分词

疑问句：

Have/has+主语+过去分词？

4、最后，牢记时态的方法就是多做题