2020年上半年大学英语六级语法：一般现在时代替完成时思维导图

hear, tell, learn, write , understand, forget, know, find , say,remember.

I hear (= have heard) he will go to London.

I forget (=have forgotten) how old he is.

2) 句型 " It is … since…"代替"It has been … since …"

3) It is (= has been) five years since we last met

语法的学习过程会觉得条目繁多，很难记，而且枯燥无味，这种情况下，学习应该寻找的是语法的学习方法。掌握方法，在学习过程中才能克服困难。更多四级语法、六级语法请及时关注树图网站。