Caged bird By Maya Angelou
A free bird leaps
on the back of the wind and floats downstream
till the current ends
and dips his wing
in the orange sun rays and dares to claim the sky.
But a bird that stalks down his narrow cage can seldom see through his bars of rage
his wings are clipped and
his feet are tied
so he opens his throat to sing.
The caged bird sings with a fearful trill
of things unknown but longed for still and his tune is heard on the distant hill for the caged bird sings of freedom.
The free bird thinks of another breeze
and the trade winds soft through the sighing trees and the fat worms waiting on a dawn bright lawn and he names the sky his own.
But a caged bird stands on the grave of dreams his shadow shouts on a nightmare scream
his wings are clipped and his feet are tied
so he opens his throat to sing.
The caged bird sings with a fearful trill
of things unknown but longed for still and his tune is heard on the distant hill for the caged bird sings of freedom.

modal adverbs are used to modify specific verbs that consist of a linking verb (verb of being) and sometimes another verb. examples of modal verbs include can, could, may, might, must, shall, should, will and would.

modal auxiliary. an auxiliary verb characteristically used with other verbs to express mood, aspect, or tense. in english, the most common modal auxiliaries are can, could, may, might, must, ought, shall, should, will, and would. also called modal .

go to crash course lititure and go to seconed page and it shows a video about that

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."