Dear Hongduyen,

"You, he and I have known each other for ten years." �

Confirming what Douglas has just written --- in �A Comprehensive Grammar of the English Language�, Professor Randolph Quirk and others, write (page 338):

� ... the rule of politeness which stipulates that 1^st Person Pronouns  should occur at the end ...�

You will know that, when we use Subject Pronouns:

        i.            The 1^st Person Singular is �I�; Plural is �we�.

      ii.            The 2^nd Person Singular is �you�; Plural is also �you�.

    iii.            The 3^rd Person Singular is �he�, �she�, �it�; Plural is �they�.

On page 355, Quirk and others explain that, when there are Pronouns, (or Proper Nouns), connected by �and�, there is a particular order, which is regarded as grammatically �correct�, in formal usage.  However, these �rules� are often broken, in informal usage.

Rather than quote the �rules�, I have written several examples.

1. You (ii) and I (i) are friends.
2. You, (ii) Peter (iii) and I (i) are friends.  ("You, he and I have known ...�)
3. You, (ii), Mary, (iii) Peter (iii) and I (i) are friends.
4. Peter (iii) and I (i) are good friends.
5. We (i) have a lot to discuss, you (ii) and I (i).
6. Freda (iii) and I (i) have finished.  We (i) can have lunch now.
7. You (ii) and John (iii) can stop now.  You (ii) can both have your lunch.
8. If you, (ii) Anna (iii) and I (i) have finished, we (i) can have lunch.
9. You, (ii) May (iii), Thomas (iii)  and their dog (iii) are in the hotel.  You (ii) can all go home together.
10. If you (ii) and John (iii) have finished, we (i) three can all go to lunch together.
11. If you, (ii) John (iii) and I (i) have finished, we (i) can all go to dinner together.
12. Mary (iii) and John (iii) are ready now. They (iii) can both go to London together.
13. She (iii) and the Italian gentleman (iii) married.  They (iii) now both live in Rome.
14. She (iii) and he (iii) married in Naples.  They have a daughter.  The family (iii) live in Sicily.

It is possible that others may have different ideas, but I hope that I have helped you.

Les