Sophia Learning
Sophia: Locating the Subject and Object in Sentences
This tutorial explains what subjects and objects are and how they are different. It offers 3 videos using the characters Nancy and Patrick: the first explains how to find subjects, direct objects, and indirect objects; the second is...
University of Calgary
University of Calgary: Direct Objects
This site, in addition to defining and providing examples for direct objects, gives various tips on identifying direct objects, both simple and complex.