口訣：隻有人才會PS(photoshop),所以主語是人的兩種花費是 pay 和 spend。

1.人 pay 金錢 for sth. 付錢買... pay-paid-paid

我花200美元買了一件裙子。

I pay 200 dollars for a dress.

2.人 spend 時間/金錢 on sth. 或 人 spend 時間/金錢 （in）doing sth. （in 可以省略） spend-spent-spent

a. 我花2個小時做作業。

I spend 2 hours on my homework.

I spend 2 hours (in) doing my homework.

b.我花200美元買了一件裙子。

I spend 200 dollars on a dress.

I spend 200 dollars (in) buying a dress.

3.物 cost sb. 金錢 某物花費（某人）多少錢 cost-cost-cost

這件裙子花費了我200美元。

This dress costs me 200 dollars.

4.It takes sb. 時間 to do sth.做某事花費某人多少時間 (It 作為形式主語) take-took-taken

我花2個小時做作業。

It takes me 2 hours to do my homework.

小試牛刀：

1.---How much does your new bike________?

---I ________ 300 yuan ________ it.

A. pay; spend...on B. cost, buy...for C. spend; paid...on D. cost;paid...for

解析： D

How much does your new bike___?這句話的your new bike是物，所以我們隻能選擇cost.

下一句 人作主語，人 pay 金錢 for sth. 付錢買..., paid 是pay的過去時。

2.It _______ me two days to finish the work.

A. took B. cost C. spent D.paid

解析： A It takes sb. 時間 to do sth.

3.This dress looks beautiful on you. How much is it?

It _______ me more than a thousand yuan.

A. cost B. took C. paid D. spent

解析： A 這裡的"It"指代 dress，物作主語，用cost 物 cost sb. 金錢

4.----I _______ 5000 yuan on this iPhone.

---- Wow, so much! I can't afford it.

A. cost B. took C. paid D. spent

解析： D 主語是人 ，然後這裡的介詞是 on, 對應 “人 spend 時間/金錢 on sth.” 這條原則

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