同学你好，该知识点来自沪江网校《零基础直达BEC商务英语高级【周年庆特惠签约班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好
with是介词，表示的意思有很多，以下是with的用法
1.
和…在一起；和；同；跟
She lives with her parents.
她同父母住在一起。
I have a client with me right now.
我现在有个客户。
2
有；具有；带有
a jacket with a hood
带护帽的短上衣
He looked at her with a hurt expression.
他带着受伤害的神情看着她。
They're both in bed with flu.
他们双双患流感卧病在床。
a man with a suitcase
提衣箱的男子
3
用；使用；以；借
Cut it with a knife.
用刀把它切开。
It is treated with acid before being analysed.
对它先用酸处理再进行分析。
4
（表示以某物填充、覆盖等）
used to say what fills, covers, etc. sth
The bag was stuffed with dirty clothes.
袋子里塞满了脏衣服。
Sprinkle the dish with salt.
在这盘菜上撒上盐。
5
与…对立；反对
to fight with sb
与某人打架
to play tennis with sb
与某人打网球
at war with a neighbouring country
与邻国交战
I had an argument with my boss.
我跟老板吵了一架。
6
关于；对于；对…来说
Be careful with the glasses.
小心这些玻璃杯。
Are you pleased with the result?
你对结果满意吗？
With these students it's pronunciation that's the problem.
对这些学生来说，成问题的是发音。
7
（涉及一事与另一事的关系）
She won't be able to help us with all the family commitments she has.
她有这么多家务事，帮不了我们。
It's much easier compared with last time.
这与上次相比容易得多。
8
包括；还有
The meal with wine came to $20 each.
包括酒这顿饭每人20块钱。
With all the lesson preparation I have to do I work 12 hours a day.
加上必须的备课在内，我每天工作12个小时。
9
（表示行为方式）
He behaved with great dignity.
他举止庄重威严。
She sleeps with the window open.
她爱开着窗户睡觉。
Don't stand with your hands in your pockets.
站着的时候别把双手插在口袋里。
10
因为；由于；作为…的结果
She blushed with embarrassment.
她难为情得脸红了。
His fingers were numb with cold.
他的手指冻麻了。
11
由于；随着
The shadows lengthened with the approach of sunset.
随着太阳西沉，影子越来越长。
Skill comes with practice.
熟能生巧。
12
与…方向一致；顺着
Marine mammals generally swim with the current.
海洋哺乳动物一般顺水而游。
13
由…持有；由…负责
The keys are with reception.
钥匙在服务台。
Leave it with me.
把这交给我吧。
14
为…工作；受雇于；利用…的服务
She acted with a touring company for three years.
她在一巡回剧团里演出了三年。
I bank with the HSBC.
我的钱存在汇丰银行里。
15
（表示分离）
I could never part with this ring.
我永远也不摘掉这枚戒指。
Can we dispense with the formalities?
我们可以免去这些客套吗？
16
虽然；尽管
With all her faults I still love her.
尽管她有种种缺点，我依然爱着她。

It是三单，但是这里的cost不是一般现在时，而是过去时，cost的过去时还是cost
祝学习愉快！