1

All water has been filtered.

or

All water have been filtered.

?

I've already searched about this especially in youtube. From what I learned, if it's an uncountable noun after determiner all, it will be treated as singular therefore has should be used.

I just need a confirmation that's why I posted a question here.

  • 1
    But you still need a definite article, since you are referring to a specific volume of water. "All (of) the water has been filtered." (of) is optional. – user3169 Sep 18 '18 at 4:09
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    No article is needed. The first example would be understandable, colloquial English as it might appear on a water container. – DrMoishe Pippik Sep 18 '18 at 4:11
1

Since water is uncountable, it always takes a singular verb, unless you refer to different water bodies (lakes, rivers, etc), in which case you could say waters and then use 'have'. But in your example, the correct one is - All the water has been filtered.

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