What is the diff. between these statements and when to use which?

[EngLearner]

Hi All,

I am new to your community and would like to improve my english with with all your help.

I need some clarification on the usage of below sentences( Please excuse me if there is already a post which explains it. If so, please guide me to it).

1. He left for Paris.
2. He has left for Paris.
3. He had left for Paris.

All the above 3 statements talks about a past action. The context is, I want to tell someone that Mr. X has left for Paris. Since all the 3 are past sentences(Past Simple, Present Perfect and past perfect respectively) what is the difference between them? When to use which one?

I would be grateful if someone can throw some light on this.

Thanks,
A Learner.

PS: I would be grateful if you could correct the errors, if any, in my explanation or subject line.

[lost_soul]

he left for Paris and he has left for Paris are the same except that the results of the former aren't connected with the present, i.e. he could leave for Paris and after some time return.

He had left for Paris - means that he left before some moment in the past (which might be expressed by an additional phrase or clause, like this When I came in I was told that he had left for Paris, or might even be implied indirectly) Also when you convert direct speech into indirect, you might need this tense (past simple and present perfect should be turned into past perfect) They said "He left (has left) for Paris" ---> They said that he had left for Paris

Just my 2 cents. (I'd appreciade it if our respected native English speakers would take pains to bear out my explanation (or refute it if it in any way appears to be wrong))
_________________
Alex

Sweet home Alabama
Where the skies are so blue
Sweet home Alabama
I'm comin' home to you

[EngLearner]

Hi lost_soul,

Do you mean we have to use past perfect only when we are talking about two past actions? Can't we use it to describe one situation like the above "He had left for Paris"?

Also, I came across some explanations in other posts that we have to use Simple Past ONLY when we can specify a particular past time like yesterday, 2 days back etc. If so, are the below statements correct?

He left for Paris 2 days back.
He has left for Paris.

Thanks,
A Learner.