彼はきっと時間内にやってきますよ。

he; him; his; boyfriend

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

surely; undoubtedly; almost certainly; most likely (e.g. 90 percent); sternly; severely; having no slack; rigid; stiff; tight; suddenly; abruptly; instantly

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 come along; to come around; to turn up; to arrive at the present; to get where one is; to have been doing something (for a period of time)

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!