次のバス停で乗り換えなくてはなりません。

next; following; subsequent; stage; station

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

bus stop

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

to transfer (trains); to change (bus, train); to change one's mind; to move on to (e.g. a new love interest); to change methods; to change one's way of thinking

if ... then; when; and; why don't you...?; the more (one does something); because; since