Verb Tenses: Past Simple vs Present Perfect

Past Simple vs Present Perfect

 

Difference between Present Perfect and Past Simple:

 

 

Signal Words:

 

Simple Past: yesterday, ... ago, in 1990, the other day,,last ...
Present Perfect Simple: just, already, up to now, until now / till now, ever, (not) yet, so far, lately / recently

Source: http://languagelearningbase.com