Sonatas. Just an "s" on the end.
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
The plural form of "is" is "are."
The plural form of "I" is "we."
The plural form of "was" is "were."
I'm not sure what you mean... The form of the sonata is sonata form. Or if you want to get fancy, it's First Movement Sonata-Allegro Form.
Sonata form is a musical structure used in the 18th century. The three movements of sonata form are exposition, development, and recapitulation.
Sonata-allegro form is a form with three main divisions: exposition, development and recapitulation (a coda is frequently added). It is not same as binary or ternary forms. The sonata form is a form itself.
in sonata form the contrasting key is established by statement of
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The plural form of "is" is "are."
The plural form of "was" is "were."
The plural form of "I" is "we."
"Groceries" is the plural form of "grocery."
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.