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If I have 2 pens and I want to say all of them are green, I can say "Both of them are green" but if I have 3 pens should I use "Triple of them are green" or "All of them are green"?

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Is that you, Dr Seuss? – Ed Guiness May 11 '11 at 10:30
Of note, triple compares to double, not both. "Triple of them are green" is wrong for the same reason "double of them are green" is wrong. – MrHen May 11 '11 at 16:22
@Ed: who is Dr. Seuss? – Anonymous May 12 '11 at 1:00
up vote 14 down vote accepted

You could go with any of the following:

All 3 of my pens are green,

All (of) my 3 pens are green,

My 3 pens are all green,

The word triple as an adjective means:

  1. Three times bigger in size or amount
  2. Having three parts or including three people or things, for example:

    a triple murder

    a triple heart bypass

When used as a verb, it means:

  1. To cause (something) to become three times as great or as many
  2. To become three times as great or as many

In mathematics:

to triple the number 4 is equivalent to multiplying 4 by 3,

written numerically as: (4 + 4 + 4) or (4 x 3) = 12

Source: M-W

Hope that helps.

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The closest construction to "Both of them are green." is "All three of them are green." – Peter Shor May 11 '11 at 12:30
Yes, @PeterShor; you're quite right. – Karl May 11 '11 at 13:53
@Peter Shor: That's exactly what i said, in one sentence. I don't know why long answers are more attractive here. – Gigili May 11 '11 at 18:46
@zizi: "All my three pens" is different from "All three of my pens," and I believe the second one is quite a bit more natural in English. You can say "All my pens" and "My three pens," but when you put these constructions together, you need to add an of. I don't know why. – Peter Shor May 11 '11 at 19:28
@Peter, it's because "All my pens" really needs an 'of', too ("All of my pens"). I think omitting the 'of' really only sounds OK because of a certain long-running TV show by the name of All My Children. – Marthaª May 11 '11 at 21:04

You can say "all my 3 pens are green" to mention the number of your pens and their color, simultaneously.

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"Each of my 3 pens are green" sounds more natural to me. – MrHen May 11 '11 at 17:26
@MrHen: "Each of my 3 pens is green" – Mr. Shiny and New 安宇 May 11 '11 at 17:54

I have three pens - all green.

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