こちらに座っていいですか。

this way (direction close to the speaker or towards the speaker); this direction; here (place close to the speaker or where the speaker is); this one (something physically close to the speaker); I; me; we; us; this person (someone physically close to the speaker and of equal or higher status)

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 sit; to squat; to assume (a position); to hold steady; to hold still

good; excellent; fine; nice; pleasant; agreeable; sufficient (can be used to turn down an offer); ready; prepared; profitable (e.g. deal, business offer, etc.); beneficial; OK

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