Grammar Question

<p>I have a grammar-related question. When is the usage of the phrase "in which" correct and when is it incorrect? I can't seem to properly identify the correct usage of that phrase.</p>

<p>I tried googling it, but I couldn't find anything. Can any of you enlighten me? =)</p>

<p>I'm not sure exactly what you're asking, but usually it's used to start a dependent clause. It can also be used as a question word.</p>

<p>I read Woolf's novel, in which she demands money and privacy for women. </p>

<p>In which cage did you put the monkey?</p>