Questions & Answers about Я забыл перчатки дома.
Why does this sentence use забыл (forgot) instead of a word for "left"?
In Russian, if you leave something behind accidentally, you must use забыть (to forget). If you use оставить (to leave), it usually implies you left it there on purpose. So, "I left my gloves at home" is literally "I forgot my gloves at home."
Is перчатки a "plural-only" noun like the ones in this lesson?
Not strictly! Unlike true plural-only nouns (pluralia tantum) such as очки (glasses) or деньги (money), a glove does have a singular form: перчатка. However, because gloves are usually worn in pairs, you will almost always use and decline this word in the plural form.
What case is перчатки in here?
It is in the accusative case because it is the direct object receiving the action of забыл. Because перчатки is an inanimate plural noun, its accusative form looks exactly the same as its nominative (dictionary) plural form.
I sometimes mix up дома and домой. Why is it дома here?
Дома is used for location (answering "where?"), meaning "at home." You use домой for direction or motion (answering "where to?"), like when saying "I am going home" (Я иду домой). Since the gloves are resting at a fixed location, дома is the right choice here.