The 3rd-graders at P.S. 277 in Brooklyn twisted upward in their seats, hands fluttering on outstretched arms like flags atop a pole. As teacher Janet Kennedy recognized them, they marched in turn t… ...

Whom is an object. It replaces him or her. We're supposed to say, "Whom do you love" because the answer is "I love him, or her." We do not say, "I love he or she." I don't mean to sound pedantic ...

The object of "for" is the whole of the following clause, and not just the relative pronoun, and that clause should follow the proper rules of subject-verb-object grammar.