There are a few things that are kind of foggy to me after all these years out of high school. 1.) The proper use of ('s). For a plural possessive is it merchants' ? 2.) I'll give an example of this one. He did it. He had done it. What are the appropriate uses of these two verb tenses. 3.) I need to see a few good examples of sentences that use the passive voice and those that do not. Thank you very much, in advance.