(literary) future trouble; later calamity; disaster later on

leaving as-is, a neglect

to neglect, to leave alone / to abandon

cause, origin / basis, foundation / cost / (finance) capital / principal

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

former, erstwhile

the Yuan dynasty (1271-1368)

a male given name

former / previous; original

(informal) no problem