4.would rather 宁愿;宁可 5.build up 逐渐增强;建立;开发 6.lead to 导致;造成 7.focus on 集中(注意力、精力等)于 8.keep...free from/of 使……免受(影响、伤害等);使……不含(有害物) 9.make a difference 造成差异,很重要 10.keep in mind 牢记在心 ...
1.should have done =ought to have done 本应该做而没做 2.would have done = 本来就会去做某事而没做 3.could have done = 本可以做某事而没做 4.might have done 本可以做而没做 例:They ought to have apologized. 他们本该道歉的。
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