Auxiliary verb

An auxiliary verb or helping verb is a verb used with another verb to express aspect.

• The primary auxiliary verbs (or primary verbs) are be, do and have;
• The secondary auxiliary verbs are get, go and used (to);
• The modal auxiliary verbs (or modal verbs) are shall, should; will, would; can, could; may, might; and must.

See also

• Semi-auxiliary

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