When writing a sentence, we want to take care to use the same plural or singular tense and not confuse our readers. This is called "subject-verb agreement". Take this two sentences, for example, the first one uses correct subject-verb agreement, while the second sentence makes an error in number agreement. Can you see the difference?
1. The pants are too small for my brother.
2. The pants is to small for my brother. The noun "pants" is plural, so the verb needs to be plural, too. "Are" is plural, but "is" is singular, so "pants are" is the correct use of the noun and verb together. Read this resources for more information on subject-verb agreement.
Here are some tips to help you avoid subject-verb agreement errors.
Two-thirds of your cake was eaten before you got home.
Source: Excelsior Online Writing Lab, https://owl.excelsior.edu/grammar-essentials/parts-of-speech/verbs/subject-verb-agreement/
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