例: so precious is time that we can’t afford to waste it.
时间是如此珍贵，我们经不起浪费它。
2、adj + as + subject(主词)+ be, s + v(虽然...)
例句：rich as our country is, the qualities of our living are by no means satisfactory.
by no means = in no way = on no account 一点也不
虽然我们的国家富有，我们的生活品质绝对令人不满意。
3、by +v-ing, ~~ can ~~ (借着...，..能够..)
例句：by taking exercise, we can always stay healthy.
借着做运动，我们能够始终保持健康。