He made five mistakes in as many lines.
Kare wa go kō de go kasho machigaeta.
he; him; his; boyfriend
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
going; travelling (traveling); type of classical Chinese verse (usu. an epic); district (of similar merchants); guild; bank
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.
passage; place; point; part
to make a mistake (in); to commit an error (e.g. in calculation); to confuse; to mistake something for something else