Using Tense Appropriately
Use simple past tense to describe something that wholly occurred at a specific time in the past:
I graduated from NYU in 1998. NOT: I have graduated since 1998. |
(That’s when the ceremony occurred.) (Incorrect!) |
I finished the Hollins project last week. I have finished the Hollins project last week. |
(Specific time) (Incorrect!) |
Use present perfect tense to describe something that has been in effect from a certain point in the past until now. Be careful! Some verbs are used for specific actions; others are used for conditions that cover lengths of time.