1、If，for example，you come at four oclock in the afternoon，then at three oclock I shall begin to be happy.I shall feel happier and happier as the hour advances.At four oclock，I shall already be worrying and jumping about.I shall show you how happy I am。比如说，你下午四点钟来，那么从三点钟起，我就开始感到幸福。时间越临近，我就越感到幸福。到了四点钟的时候，我就会坐立不安；我就会发现幸福的代价。