def findTheWordsBefore(paragraph):
	import re

	prose = re.compile(r"(\s\w*\s\w*\s\w*\s)+drill")
	List = prose.split(paragraph)
	return List

with open("how_2_use_drill.txt", "r" ) as source:
	for line in source:	
		sentences = findTheWordsBefore(line)
	   	for s in sentences:
	    		print s.strip()