What are the functional and grammatical rules of poetry?

[timote]

When writing poetry, what are the rules for it? What are the grammatical structures of it?

[Amphigory]

Depends on the form you're writing in. There are a lot of different kinds of poetry!

I'd recommend you read The Ode Less Travelled, by Stephen Fry. It covers pretty much everything you need to know to begin writing poetry.

[powernick]

its depend that on which topic you are writing poetry...!

[lanedraven]

As has been said, it depends on the topic, and there is no set grammatical structure.

Some authors go out of their way to avoid any grammatical structure at all, while others use forms which require complex rhythmical planning and elaborate rhyme schemes.

Are there any forms in particular you are interested in (like Sonnets for exemple)?

[Morpheus]

One has to write what one feels first and then study how to let it out unless you're writing in a particular style or r. scheme.

[katarina66]

I think poetry is a very personal thing. It is a pouring out of the poet's feelings and emotions. Many modern poems I can't understand. Free verse can be writen in any style you chose, while other poets prefer to be very structured.
my thought for what they are worth.