もし私がひまであれば、彼の招待を受けるのだが。

if; in case; supposing

I; me; private affairs; personal matter; secrecy; selfishness

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

spare time; free time; leisure; time (e.g. time it takes to do something); time off; day off; vacation; holiday; leave; quitting (one's job); firing someone; divorcing (one's spouse); (of one's time) free; (of one's business) slow; leaving; departing

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

a certain ...; some ...

he; him; his; boyfriend

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

invitation

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 receive; to get; to catch (e.g. a ball); to be struck by (wind, waves, sunlight, etc.); to sustain (damage); to incur (a loss); to suffer (an injury); to feel (influence); to undergo (e.g. surgery); to take (a test); to accept (a challenge); to be given (e.g. life, talent); to follow; to succeed; to be descended from; to face (south, etc.); to be modified by; to obtain (a pawned item, etc.) by paying a fee; to be well-received; to become popular; to go down well