The National Endowment for the Humanities (NEH) offers sample narrative sections from successful applications for review. Each NEH funding program has several available to give applicants good ideas on how successful NEH application narratives are constructed.
To review these sample application narratives, go to the web page listing all NEH grant programs and select the program of interest to you. In the column on the right of your screen titled "Guidelines Resources", go down to Sample Application Narratives and select the one(s) you wish to read.
One other note about NEH: Many NEH funding programs provide opportunities for review of your draft application in advance of the deadline. NEH program staff read your draft and provide comments to you. While this does not guarantee an award, NEH indicates that many applicants have found this service helpful. Check the guidelines for your particular funding program to see if this service is available.