conjunction
1
BAD : At night we used to go out with our friends or stayed at home listening to music.
GOOD : At night we used to go out with our friends or stay at home listening to music.
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When you use or to join two verbs, both verbs should have the same form. Compare: 'We used to go to the cinema or watch the television.' 'We went to the cinema or watched the television.'
2
BAD : I think the microphone or the recording mechanism are broken.
GOOD : I think the microphone or the recording mechanism is broken.
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When each of the nouns joined by or is singular, the verb is usually singular: 'It is important to understand what one's son or daughter expects out of life.'
3
See NEITHER 1 (↑ neither )