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11. spend, cost, take “花费”
“spend” (spent, spent) 花“时间，金钱”主语须是人。
He spend 5 hours writing the article.
“cost” (cost, cost) 花费“金钱，时间，劳力”可接双宾，主语须是“物”
The book cost me $20 and 2 days.
“take” 通常指花“时间”主语须是“某种事情”
It takes me 20 minuter to go to school.
The work took me longer than I expected.
12. assure，ensure
“assure” 使放心 assure sb. of sth.
assure sb. that...
I can assure you of my honesty.
“ensure” 保证 ensure sth.（其后不能接人称）
ensure that
ensure doing sth.
I can ensure his safety.
He ensured that he finished the job in time.
He ensured coming back later.
百分重点：如ensure 含义为“保护，使安全”，其结构为：
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