I have three cars, all of them are white. I wish to form a sentence where I list the cars separately as: first, second and third, and then say they are all white. I’m unsure what is the correct form:
First, second and third car are white.
First, second and third cars are white.
First, second and third car is white.
I do not wish to change the structure of the sentence. Unless none of them are correct, what is the closest possible correct form?
Sentence 2 is correct. You are referring to three distinct objects, so your noun and verb must both be plural. The noun and the verb must agree in number. The adjectives don’t matter.
Some more examples:
My brother and sister are silly, but my mother is not.
My brothers are silly, but my sister is not.
And now with adjectives:
My pink and white dress is too small. (One dress)
My pink dress and my white dress are too small. (Two dresses)
My pink and white dresses are too small. (Two dresses)
My first dress is too small, but my second dress is too big. (One dress each)
My first dress is too small, but my other dresses are too big. (One dress, many dresses)
My first, second and third dresses are too small. (Three dresses)