Auxiliary verbs, or “helping verbs,” are used in English to change another verb’s tense, voice, or mood. When auxiliary verbs are used, there’s always a main verb that represents the main action. However, the auxiliary verb must still be conjugated correctly.
The main auxiliary verbs are be, have, and do. We explain how they’re used specifically for conjugating below, but here are a few quick examples:
I have eaten sushi many times before. (tense)
That piece of sushi was eaten by me. (voice)
Did you eat my sushi? (mood)
Modal auxiliary verbs
Some auxiliary verbs are added to another verb to show necessity, possibility, or capability. Like other auxiliary verbs, modal auxiliary verbs are not the main verb, but they do change its meaning slightly. Some common examples are can, may, could, should, would, must, ought, and might.
I could swim across the English Channel, but should I do it?
She must be the strongest person on the team, and might be the strongest person in the region.
Phrasal verbs
Phrasal verbs are phrases that act as individual verbs, often combining two or more words and changing their meaning. The verb get, for example, becomes many different phrasal verbs when combined with different prepositions.
When the bus stops, passengers get out on the sidewalk.
After losing his job, he’s getting by on savings.
The important thing to remember about phrasal verbs is that they act as a single verb, so you can still use them with other verbs and prepositions. However, when you conjugate a phrasal verb, you only conjugate the part of the phrase that’s actually a verb, like get.
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