Correct me on the following. We say<br/><br/>This is a cat, isn't it?<br/><br/>But how to say<br/><br/>This is him (he), <b>isn't it?</b><br/><br/>or<br/><br/>This is him (he), <b>isn't it he (him)?</b><br/><br/>Plus<br/><br/>These are they, aren't the? <br/><br/>or<br/><br/>This is them, isn't it them?<br/><br/>Give me the right variants.