present perfect or past simple

[steven white]

what,s the differnce between these two sentences?
I have studied my lessons.
I studied my lessons.

[steven white]

what,s the differnce between these two sentences?
I have studied my lessons.
I studied my lessons.

[mamen]

what,s the differnce between these two sentences?
I have studied my lessons.
I studied my lessons.

Both do imply the same thing.

But, here is the point: You can not add a time indicator in your first sentence; you may or may not put a time indicator in your second sentence.

[steven white]

thanks a lot

[Trance Freak]

Both do imply the same thing.

But, here is the point: You cannot add a time indicator in your first sentence; you may or may not put a time indicator in your second sentence.

Says who?
i. I have studied my lessons.
Time Indicator:
I have recently studied my lessons.

ii. I studied my lessons.
Time Indicator:
Last night, I studied my lessons.

--> Simple Past refers normally to an action that started & finished in the past.
Present Perfect refers to a recently finished action that started in the past.

[mamen]

Says who?
i. I have studied my lessons.
Time Indicator:
I have recently studied my lessons.

ii. I studied my lessons.
Time Indicator:
Last night, I studied my lessons.

--> Simple Past refers normally to an action that started & finished in the past.
Present Perfect refers to a recently finished action that started in the past.

What I mean is this:

I have studied my lesson yesterday.

[Trance Freak]

What I mean is this:

I have studied my lesson yesterday.

No honey!!!
"Yesterday" is a precise definite signal word referring to an action that occured in the past. -As in the case of "ago"
-->One may NOT say: I have studied my lesson yesterday.

[mamen]

No honney!!!
"Yesterday" is a precise definite signal word referring to an action that occured in the past. -As in the case of "ago"
-->One may NOT say: I have studied my lesson yesterday.

ok thanks..

[ha179]

Not a teacher.

what's the difference between these two sentences?
I have studied my lessons.
I studied my lessons.

Use present perfect tense when you don't mention the time the action happened.
Ex: I've had breakfast. (The listener just know that you had breakfast, not when you did it)
Past simple tense is used when you mention the time.
Ex: I went out last night.
But I've seen the past simple tense is used even when the speaker/writer doesn't mention the time in American English.

[RonBee]

Simple Past refers normally to an action that started & finished in the past.
Present Perfect refers to a recently finished action that started in the past.

That sums it up.