auxiliary verb

noun
UK /ɔːɡˈzɪliəri vɜːb/
US /ɔːɡˈzɪliəri vɜːrb/

A helping verb that works with a main verb to show time or mood.

In the sentence 'She is running,' the word 'is' is an auxiliary verb.


OTHER MEANINGS

2. A verb like 'be', 'have', or 'do' used to form questions, negatives, or tenses.

'Do' is an auxiliary verb in 'Do you like tea?'

3. A modal verb such as 'can', 'must', or 'should' that adds possibility or obligation.

'Must' is an auxiliary verb in 'You must go now.'

4. A verb that helps express passive voice.

'Was' is an auxiliary verb in 'The cake was eaten.'