For color adjectives which end in -ㅎ, special conjugation rules apply.
isnt 노래 song?
노래 = song
노래이다 conjugates to 노래예요: "is a song"
노랗다 conjugates to 노래요: "is yellow"
Why is " The yellow house is expensive" is wrong?
Because the whole meaning of the sentence will be different.
You can say
all big dogs are animals.
But not all big animals are dogs.
because the subject is yellow. the expensive is adjective to the house
no, the verb is ,,is yellow"
노래요 means "is a song" or "is the song"
It is homonym
노래이다 conjugates to 노래예요.
Is "Expensive houses are yellow" wrong?
It should be correct, 은/는 can mean a generalization
do korean use this adjectives in common daily?
,,An expensive house is yellow"? ,,Expensive houses are yellow"? What's wrong??
Why the costly house is yellow is wrong?
Because it's a non-standard answer. Correct answers are manually added, so just report that your answer is correct.