In English polite form of address is "You" which is second person singular and plural. In Russian it is "Вы" which is plural second person. In Spanish (and probably French and Italian) polite address ...
I remember learning the rule for when to use cualquier, cualquiera, and cualesquiera, but was always confused about the exact differences. When should each be used, and what role do number, gender, ...
In English, words like pants, shorts, and jeans appear to be in the plural but really refer to one item of clothing (I don't know what the technical term for it is). To be more specific, you can say ...