彼の脈は規則正しいですか。

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

pulse; vein; chain (of mountains, etc.); hope; thread (of an argument)

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

regular; well-regulated; systematic

be; is

indicates a question (sometimes rhetorical); or; whether or not; some- (e.g. something, someone); indicates doubt, uncertainty, etc.; emphatic prefix; suffix forming adjectives or adverbs; in that way