General Writing and Grammar Help/present perfect

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Question
Hi
I have  questions.

what is different between present perfect and present perfect continuous?
and can we use "ever" ,"already" and "yet" in same sentences?
for example :

Have you ever been to Korea already?

I haven't ever been to Korea yet.
Thanks

Answer
Dear Farzad:

NOW, we are Allexperts brothers!

****

what is different between present perfect and present perfect continuous?

EXAMPLES:  I think about you every day. [think = present tense]

I thought about you last week.  [thought = past tense]

I have thought about your wanting to study in the United States. [have thought - present perfect tense]

I have been thinking about your studying in the United States. [have been thinking = present perfect tense, continuous form]  NOTE: this form is often called the "present perfect tense, progressive form, because the "-ing" at the end of "think" shows a motion or progress.

Here's the difference between the two perfect tenses verbs:

I have thought -- means that my thinking began at some unknown time in the past and that thinking has continued UP TO THE TIME OF MY SPEAKING [THE PRESENT]

I have been thinking -- the process of my thinking began at some unknown time in the past, but, because it is stated as progressive [or continuous], my thinking is still going on AT THE TIME OF MY SPEAKING [THE PRESENT]

*** Farzad, if you want to indicate that an action has ended, you must use the PAST TENSE.  However, think of the PERFECT TENSES as lying on a line -- a time continuum.  Any action expressed using A PERFECT TENSE will begin to on the left side of the line, but it will not stop until the reach the part of the line marked as "present" or "time of speaking."  Of course, if you use the FUTURE PERFECT TENSE, your action will extend to the right of the "present mark."

Here are four excellent web sites that give explanations, with examples -- AND SOME HAVE LITTLE TESTS YOU CAN TAKE.

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

and can we use "ever" ,"already" and "yet" in same sentences?
for example :

Have you ever been to Korea already?

I haven't ever been to Korea yet.

*** You can use "ever," but you can't use "yet" or "already" at the same time.

Have you ever been to Korea?
Have you been to Korea yet?
Have you already been to Korea?

You can USE ONE of your words in each sentence, but you cannot use TWO of them.

Ted

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Ted Nesbitt

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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.

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

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

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