"dawned on sb" This is one part of my article ----- I installed one of google extensions that can help you to know who removed you from their friend list of facebook. When it suddenly dawned on me that how useful this extension is, the extension noticed me that her ex-girlfriend removed us from her friend list. Because most of time you wouldn't check your friend list and find out who deleted you. ------ "When it suddenly dawned on me that how useful this extension is, the extension noticed me that her ex-girlfriend removed us from her friend list." I learned "dawned on sb" recently, but I'm not sure my expression is correct or not :O These are two examples I found on the Internet and I imitate the structure and put into my sentence. (eg: I was about to pay for the shopping when it suddenly dawned on me that I'd left my cheque book at home. eg: ...when it dawned on me how much l was willing to give up for a cigarette.) thanks for your response