What is agreement as it relates to grammar?

[v]ast numbers of our people are compelled to seek their livelihood by begging, robbing, stealing, cheating, flattering, suborning, forswearing, forging . . which satirical element is most dominant in the passage above?

Besides the skull and cross bones what other shape sometimes appeared on flags flown by pirates?

How might current written and oral pieces that we produce every day (blogs, text messages, social network posts, videos, television shows, etc.) be considered piece of folklore?