Answer:
quatrain.
Step-by-step explanation:
The structure of a poem refers to the way it is presented to the reader. This could include technical elements such as the line length and stanza format. Also, line length shows the reader how it should be read.
Hughes's poem "Theme for English B" includes a four-line stanza at the beginning. This is called a quatrain.
A quatrain can be defined as a poem that is written in four (4) lines or a stanza that is comprised of four (4) lines.