Is Fish were swimming in the water correct or should it be Fish was swimming in the water

The correct sentence is "Fish was swimming in the water".

In this sentence, "fish" is a collective noun, which refers to a group of fish as a whole. It is treated as a singular noun, so the correct verb is "was".

Here are some related questions and their answers:

What is the subject of the sentence? The subject is "fish".
What is the verb of the sentence? The verb is "was swimming".
What is the object of the sentence? There is no object in this sentence.
What is the tense of the sentence? The sentence is in the past tense.
What is the mood of the sentence? The sentence is in the indicative mood.

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Is Fish were swimming in the water correct or should it be Fish was swimming in the water?