because “a copy” is singular you would use IS

“A copy of the documents is enclosed.”

Enclosed Documents

A copy of documents is enclosed.

Here, you are referring to the copy, not documents.

Another example is,”A group of students has arrived.”

A copy of the documents is enclosed.

Copy is the noun and is singular. Of the documents is a prepositional phrase, and is enclosed is the verb.

A copy is enclosed, because copy is singular since there is only one of them. If it was copies are enclosed, then you would use are because copies is plural.

If you’re using Microsoft Word, it has a built-in watermark feature. In Word versions prior to Word 2007: 1. Click on the Format->Background->Printed Watermark menu item. If Printed Watermark is disabled (grayed out), the document is probably in Web page view. You can’t use watermarks on Web pages. 2. In the dialog box, select Text Watermark. 3. Put the text you want in the Text combination box. 4. Select Diagonal or Horizontal. 5. Select Semitransparent 6. Click OK. 7. Click the Tools->Options menu item. 8. Click the Print Tab. 9. Under Include with Document, check the checkbox for Drawing Objects. 10. Click OK. In Word 2007: 1. On the Page Layout tab on the ribbon, in the Page Background section, click Watermark. 2. Click Custom Watermark. 3. In the dialog box, select Text Watermark. 4. Put the text you want in the Text combination box. 5. Select Diagonal or Horizontal. 6. Select Semitransparent 7. Click OK. 8. Click the Office Button. 9. Click the Word Options button. 10. Click the Display tab. 11. Under Printing Options, check Background Colors and Images 12. Click OK. That should do it.

A copy of the documents is encolsed.

Copy is the noun, and it is singular.

“is” is correct…”of the documents ” is the prepostional phrase so the fact that “documents” is plural means nothing. The “copy” is singular so use the singular “is”. (Copies are, Copy is)

You would say “A copy is enclosed.” So “is” is correct.

“Copies of the documents are enclosed”