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Which one is correct in American English?

a)Imagine giving food to a fish that is more than what she needs. Do we need that "that " after fish?

b)Imagine a fish being given food more that is more that what she needs. Do we need that "that " before is?

c)Imagine a fish being given more food than what she needs.

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Comments  
The most natural way to say this is, "Imagine giving a fish more food than it needs" or "Imagine a fish getting more food than it needs."

I think it's interesting that you used "she." Is "fish" a feminine noun in your language? In English, an animal whose sex is unknown is usually referred to as "it" or "he". Pets, of course, are called "he" or "she" according to their actual sex. (I'm not saying "she" is wrong -- it's just surprising when referring to a non-specific fish. Unless, of course, you are talking about about female fish.)
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So, are all of my sentences correct?
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bassaa)Imagine giving food to a fish that is more than what she needs. Do we need that "that " after fish?
b)Imagine a fish being given food more that is more that what she needs. Do we need that "that " before is?
c)Imagine a fish being given more food than what she needs.
Your sentences are all awkward in English, for various reasons.

In (a), after reading "Imagine giving food to a fish that is...", I expect the rest of the sentence to say something about what the fish is, not what the food is. Also, "what" is not needed.

(b) There must be at least one typo here -- "more that is more that what she needs" doesn't make any sense.

(c) Take out "what," and this one is fine.
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Why is it incorrect to put what in (a) and (c)?
The "what" is not really incorrect -- it's just not necessary. You can keep if it you want to.
Students: We have free audio pronunciation exercises.
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Yes, fish in my language is feminine and cats,the sun,flowers,ducks,snakes,chikens....... .