これらのティーカップは対になっている。

these

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

tea; tee

cup (drinking vessel, measure, brassiere, prize, etc.)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

opposite; opposition; versus; vs.; v.; to (e.g. "winning a game five to three"); equal footing; equal terms; against ...; anti-; toward ...; to ...

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to become; to get; to grow; to be; to reach; to attain; to result in; to prove to be; to consist of; to be composed of; to succeed; to be complete; to change into; to be exchanged for; to play a role; to be promoted; to do ...