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General Writing and Grammar Help/present perfect and simple past tense

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Question
Hi my dear friend
What is different between present perfect and simple past tens.
I could not understand when i have to use simple present.
for example
I have translated the museum catalog into English.
or
I translated the museum catalog into English.


Thank you for taking time.

Answer
Dear Friend Farzad:

What is different between present perfect and simple past tens [TENSE].
I could not understand when i [I] have to use simple present.
for example
I have translated the museum catalog into English.
or
I translated the museum catalog into English.

**** I have always said that the two most difficult aspects of the English language
are the verb tenses and the subjunctive mood verbs.  If we were talking face-to-face, I
would be able to explain ALL the verb tenses and their various forms in half an hour.
Because you are so very intelligent, it would probably take less than half an hour.

*** I translate museum catalog into English.  The verb "translate" is the SIMPLE PRESENT
FORM.  You are stating what you PRESENTLY do, as if translating is your job.

I have translated the museum catalog into English.  "Have translated" is the PRESENT
PERFECT TENSE.  It means that, at some unknown time in the past, you began the translating.
At the present time [also called "NOW" or "THE TIME OF SPEAKING"], your translating has
ended.  You began translating some time in the past, but NOW, you have completed the
translating.

I translated the museum catalog into English.  "Translated" is the SIMPLE PAST.  Using
this tense tells us two things:  Your translating BEGAN sometime in the past, and your
translating ENDED sometime in the past.  We don't know when the translating started, and we don't know when it ended.  All we know for certain is that you are NO LONGER translating.
Your translation is FINISHED; it is OVER.

I am pasting in below four web sites that are useful in understanding how verb tenses
work:

http://www.dailygrammar.com/archive.html

http://www.englishpage.com/verbpage/verbtenseintro.html

http://grammar.ccc.commnet.edu/grammar/index2.htm

http://grammar.ccc.commnet.edu/grammar/quizzes/tenses/tenses_frame.html

*** The last one contains a short test so that you can see how well you did.  The
sentences are "tricky," so you have to read them very carefully.

Now, Farzad the Magnificent, you must do two things:

First, evaluate my answer, making sure that you check the box for "volunteer of the
month."

Second, you will probably have more questions about the perfect tenses.  Please send
them to me.

I miss you.  When we will Skype again?

Ted

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Ted Nesbitt

Expertise

I am the bibliographic instruction and reference librarian at a public college. Some members of the English department recommend me to their students. I offer assistance in grammar, punctuation, sentence structure, and paragraph development. My master`s thesis concerns William Faulkner`s tragic novels. I formerly taught advanced placement English at two schools in the Philadelphia area.

Experience

I have been one of the highest-ranked volunteers in this category for more than a decade.

Education/Credentials
B. A. and M. A in English; MSIS in Library & Information Sciences; graduate study in philosophy

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