Singular: when talking about one object
plural: when talking about multiple objects
(singular, single)
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Use the singular form when referring to one specific item or individual. Use the plural form when referring to more than one item or individual. Remember to match the verb, pronouns, and articles accordingly with either singular or plural nouns in a sentence.
No, "had" is not plural. It is the past tense form of the verb "have."
Has is used only for the third person singular (he, she, or it has).All other persons, singular or plural, use "have."
"Need" is singular. If referring to multiple needs, it is appropriate to use the plural form "needs."
The word 'criteria' is the plural form of the singular word 'criterion'. 'Those are the criteria that I used in making my decision.' 'That is the criterion that I used in making my decision.' It is wrong to use the word 'criteria' as a singular. Similarly, it is wrong to use 'phenomena' as a singular. It is the plural form of the singular word 'phenomenon'.
No, "were" is a plural verb form. When the subject is singular, you should use "was."