What are the characteristics of auxiliary verbs?

Anglès tècnic - Atenció a persones en situació de dependència

a: They help form certain tenses.
b: They are always the main verbs in a sentence.
c: They can only appear in interrogative sentences.
d: They are used exclusively in written communication.

Resposta correcta: a

Explicació: Auxiliary verbs are used to assist the formation of various tenses and are not limited to any specific type of sentence.

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