"ENSURE" and "INSURE"

"Ensure" means to guarantee or make certain. "Insure" refers to obtaining insurance coverage. Ex.: Please ensure the door is locked. We need to insure our new car.

"PRECEDE" and "PROCEED"

"Precede" means to come before in time or order. "Proceed" means to continue or move forward. Ex.: The introduction precedes the main text. After the break, we will proceed with the meeting.