Here's a nice explanation about the difference between "begin" and "start" http://www.english-test.net/articles/24/

Hmmm can you provide us with a few examples of the verbs you want to use, 'to be a verb' This is a little vague to be able to give a good clear answer. You mean things like be lazy, be upset etc, or things like to be a driver, to be a pilot, or things like eat, wash?