1 时光飞逝time goes by

正确的，time flies

2 我热的受不了I am very hot

l can not stand bear the heat

3 我给你发了封邮件

l send e-mail to you

l sent you an email

4 这本书花了我10元。

it takes me 10 to buy the book

it cost me 10yuan

5 你可以把门开着。

you can open the door

you can leave the door open

6 第一步总是最重要的。

the first step is the most important

the first step is important