B2
S + be + twice / three times + as + Adj + as + O · S + be + N + times + Adj-er + than + O
twice as ... as 和倍数表达
讲解
表示倍数的比较。用 as ... as 时，倍数放在第一个 as 之前。用比较级时，倍数放在形容词之前。half as ... as 表示只有一半。 常见陷阱：倍数放在 as 之前：as twice big as ✗, twice as big as ✓。
例句
This room is twice as big as mine.
这个房间是我的房间的两倍大。
The new model costs three times as much.
新款的价格是三倍。
Their team scored four times more points.
他们队的得分是四倍之多。
It takes half as long by train.
坐火车只需要一半的时间。
练习
通过选择题测试你的掌握程度
高效学习“S + be + twice / three times + as + Adj + as + O · S + be + N + times + Adj-er + than + O”
语法点“S + be + twice / three times + as + Adj + as + O · S + be + N + times + Adj-er + than + O”（twice as ... as 和倍数表达）是 CEFR 4 级别的重要结构之一。要熟练运用这个结构，你需要弄清楚它的使用语境，并经常练习。
学习小贴士：把例句大声朗读多遍，培养自然的语感反应。然后试着结合自己的生活情境造句。用发音按钮听标准发音并跟着练习。
你也可以查看完整课程“”，更深入地了解相关的语法和词汇。