plz help me.I came across these sentence and don't know how to understand them<br/><br/>1)what would you do if your car <u>was</u> stolen( why <i>was</i> is correct in this case?)<br/><br/>2) Let's listen to____ the piano.<br/><br/>a)what he plays c) him playing<br/><br/>b)his playing d) Mary's playing<br/><br/>thanks in advance