The U.S. is <b>26 times</b> <i>as big as</i> Japan.<br/>The U.S. is <b>26 times</b> <i>bigger than</i> Japan.<br/><br/>1. <b>How many times</b> <i>as big as</i> Japan is the U.S.?<br/>2. <b>How many times</b> <i>as big</i> is the U.S. <i>as</i> Japan?<br/><br/>3. <b>How many times</b> <i>bigger than</i> Japan is the U.S.?<br/>4. <b>How many times</b> <i>bigger</i> is the U.S. <i>than</i> Japan?<br/><br/>X. <b>How many times</b> is the U.S. <i>as big as</i> Japan?<br/>Y. <b>How many times</b> is the U.S. <i>bigger than</i> Japan?<br/><br/>Which are grammatically OK, and which sounds the most natural?