彼は彼女が弟とデートしていることに腹を立てた。

he; him; his; boyfriend

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

she; her; her; girlfriend; sweetheart

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

younger brother; little brother; kid brother; pupil; apprentice

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

date; go on a date

thing; matter; incident; occurrence; event; something serious; trouble; crisis; circumstances; situation; state of affairs; work; business; affair; after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to; nominalizing suffix; pretending to ...; playing make-believe ...; alias; aka; nickname; alternative name; also known as

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

abdomen; belly; stomach; womb; one's mind; one's real intentions; one's true motive; courage; nerve; willpower; generosity; magnanimity; feelings; emotions; wide middle part; bulging part; inside; interior; inner part; anti-node; counter for hard roe; counter for containers with bulging middles (pots, vases, etc.)

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to stand up; to put up; to set up; to erect; to raise; to thrust into; to bury into; to dig into; to make (a noise); to start (a rumour); to raise (a cloud of dust, etc.); to cause; to make; to establish; to set up; to develop; to formulate; to put up (a political candidate); to make (one's leader); to treat with respect; to give (someone) their due; to make (someone) look good; to avoid embarrassing (someone); to sharpen; to make clear; to shut; to close; to make tea (macha); to perform the tea ceremony; to divide by; to do ... vigorously