彼は借金を全部払ったが、それは彼の誠実さの証拠である。

he; him; his; boyfriend

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

debt; loan; liabilities

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.

all; entire; whole; altogether

to pay (e.g. money, bill); to brush off; to wipe away; to clear away; to dust off; to cut off (e.g. branches); to drive away (e.g. one's competitors); to sell off (something unneeded); to dispose of; to pay (e.g. attention); to show (e.g. respect, concern); to make (e.g. effort, sacrifice); to expend; to exert; to move out (of one's own place); to vacate; to sweep (e.g. one's legs); to knock aside; to make a sweeping stroke (in Japanese calligraphy); to reset (an abacus)

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

that (indicating an item or person near the listener, the action of the listener, or something on their mind); it; that time; then; there (indicating a place near the listener); you

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

sincere; honest; faithful

evidence; proof

be; is; indicates past or completed action; indicates light imperative

a certain ...; some ...