Sorry for such ridiculous question, but I cant find an answer by myself. I have a one column row ( row with one column in it ) and two column row ( with two columns in it ). The question is : what is the correct variant ( two column row or two columns row or the third one ) and how I can find grammar rules about that?
When a 'number + noun' compound acts as an adjective, it will not take the plural form, even though the number is a plural one. The reason is that the English adjectives have no plural form.
So, the correct usage is two-column row, three-column row etc. Normally we say A five-star hotel, not a five stars hotel.