Question

which pattern of meter is used in this excerpt from “the time of the ancient mariner” by samuel taylor coleridge

Answer 1

It really depends on the excerpt that you have been given. Is this the one? I found in somewhere on the Internet.

The Bridegroom's doors are opened wide,

And I am next of kin;

The guests are met, the feast is set:

May'st hear the merry din.'

If this is the excerpt you have, then the answer is simple - alternating tetrameter and trimester. Tetrameter means that there are 4 meters in one line, and given that one meter consists of two syllables, that would mean that there are 8 syllables in one line. Similarly, trimester means that there are 3 meters, or 6 syllables in one line.