Today's English Grammar Rule discusses the three similar words assure, ensure, and insure.
ASSURE means to give confidence; ENSURE means to confirm something; and INSURE means to obtain an insurance policy. See the sentences below that exemplify the proper usage of each word.
ASSURE: The student assured me that he would not be late for his tutoring session.
ENSURE: I called to ensure that the caterers would arrive by noon.
INSURE: Both automobiles are insured for liability only.