A traditional haiku consists of three lines, with the first line having five syllables, the second line having seven syllables, and the third line having five syllables.

Haiku poems do not typically follow a rhyme scheme.

A kireji is a word or phrase that creates a pause or break in a haiku, often used to emphasize a particular image or idea.

This is an example of a traditional haiku, with a 5-7-5 syllable count, nature imagery, and a kireji (the word 'in').

Senryu is a type of haiku that does not follow the traditional 5-7-5 syllable count, but still retains the focus on everyday life and human nature.

This is an example of a senryu, as it does not follow the traditional 5-7-5 syllable count, but still focuses on a human emotion (pain) and everyday life.

Haibun is a type of haiku that is written in three lines, but does not follow the traditional 5-7-5 syllable count. It often includes prose or other elements in addition to the haiku.

This is an example of a haibun, as it is written in three lines, but does not follow the traditional 5-7-5 syllable count. It also includes prose (the first line) in addition to the haiku.

Gogyohka is a type of haiku that is written in two lines, instead of the traditional three lines. It often focuses on a single image or idea.

This is an example of a gogyohka, as it is written in two lines and focuses on a single image (the solitary crow on a bare branch).

Tanka is a type of haiku that is written in four lines, instead of the traditional three lines. It often includes a seasonal reference or a personal reflection.

This is an example of a tanka, as it is written in four lines and includes a seasonal reference (twilight) and a personal reflection (waiting for its prey).

All three poets, Basho, Buson, and Issa, are known for their contributions to haiku variations, such as senryu, haibun, and tanka.

Haiku can be written in English or other languages, as long as they follow the traditional structure and style of haiku.

This is an example of an English haiku, as it follows the traditional structure and style of haiku, but is written in English.