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So, if I see multiple fishes in an aquarium, I need to use "fish", right? Shall I say "Fish swim" or "Fishes swim" in this case? ____ For using this word correctly in English, do I need to say "fish" any time, when I see fishes of different kinds, but I don't want to accentuate their variety?
The plural of fish is usually fish, but fishes has a few uses. In biology, for instance, fishes is used to refer to multiple species of fish. For example, if you say you saw four fish when scuba diving, that means you saw four individual fish, but if you say you saw four fishes, we might infer that you saw an undetermined number of fish of four different species.
"fish" can refer to either the singular or plural. If it were referring to singular then the correct verb conjugation is "swims" but you would need it to be preceded by an article ("a" or "the") or some other determiner (such as a possessive determiner like "my" etc) so it would be "the fish swims". As there is no article before it you know two things: firstly the "fish" is referring to the plural form of "fish", and secondly you are making a generalization referring to all fish. If you were referring to specific fish (plural) you would still need the preceding article or other determiner. So to answer your question, "fish swims" is not correct. In fact it is pretty meaningless in English without the preceding article.
I put "Fish are swimming" and got wrong, but clearly the progressive form could be used here. btw, I wonder if there's an expressional difference between simple present and present continuous in German. If so, how should I say "he do" and "he is doing" respectively? Thanks for your help.
I learnt that cerrain words in english, like "fish" and "chicken" have both plural or singular form, but in different circumstances when we are refering to food, we don't use the singular form for example:we eat fish(although maybe there is more than one fish) In this case we are refering to living animals, so it should be in plural form----"fishes"
Not quite, case is used to refer to forms of nouns (& adjectives) which are used to show different roles in the sentence (e.g. the nominative case is used for subjects). I'd simply say swimming is the incorrect form (you could say it is the wrong tense, but since it's a participle/gerund it's not really a matter of tense either).
I'm happy to see that many English speaking participants also see the error or fische schwimmt as not an error. I often buy one, only one, fish at the market. I say to the seller "I would like just one fish, please." I will also say fish as plural, as when I want to buy a lot of fish. So both conjugations of the verb would be correct -- schwimmt and schwimmen, depending upon the context.