"That is not an apple."
Translation:Das ist kein Apfel.
keinen is for accusative, which is not the case here. We are using nominative, where ein(e) apply, and therefore kein(e) too. Think of: Das ist ein Apfel. As a rule to remember, the verb sein (to be) takes nominative.
To use keinen, you need a verb requiring accusative (a direct object), such as haben. Ich habe einen Apfel - Ich habe keinen Apfel
I think because it is a predicate nominative. "that" is the subject of the sentence, which is also the apple. Therefore apple is also nominative.
If you said that, you'd have to follow it up with a secondary clause stating what it is.
"Das ist nicht ein Apfel, sondern eine Orange" would be fine.
Because it's an apple, not the apple. Indefinite articles generally use kein.
Suppose I swapped "Das" with "Er", would the sentence go "Er ist keiner Apfel" then?
Could someone please explain why 'Apfel' and 'Jungs' which are both masculine use 'kein' and not 'keinen' the former of which has been used for other masculine nouns.
It does not depend on the word, but in the verb. Note the difference in these sentences:
Ein Apfel ist gut -- Kein Apfel ist gut
Das ist ein Apfel -- Das ist kein Apfel
Ich habe einen Apfel -- Ich habe keinen Apfel
The first two sentences use the verb 'sein' which always takes nominative. However, the verb 'haben' requires a direct object to have sense (transitive verb) and takes accusative.
Nominative triplet: ein/eine/ein and kein/keine/kein
Accusative triplet: einen/eine/ein and keinen/keine/kein
I am unsure when you can use der/die/das for "that." In other lessons it says that you can use the above mentioned if you know the gender of the object referenced as "that" but when I put in "der is kein Apfel" it is marked wrong. Even under the hover-over menu on the word "that" it says at the bottom "der/die/das" Can someone please clarify when you use der or die as opposed to das when the object is not neutral? Thanks
Why is it not das ist kein EIN Apfel?? Doesnt this say "that is not apple"? I feel like we are missing a word?