错：The outage shouldn't effect any users during work hours.

　　对：The outage shouldn't affect any users during work hours.

　　对：The outage shouldn't have any effect on users.

　　对：We will effect several changes during the downtime.

　　注：Impact 不是动词。你可以考虑用 affect 来代替：

　　错：The outage shouldn't impact any users during work hours.

　　对：The outage shouldn't affect any users during work hours.

　　对：The outage should have no impact on users during work hours.

　　6. You're 和 your

　　错：Remember to defrag you're machine on a regular basis.

　　对：Remember to defrag your machine on a regular basis.

　　错：Your right about the changes.

　　对：You're right about the changes.

　　7. Different than 和 different from

　　错：This setup is different than the one at the main office.

　　对：This setup is different from the one at the main office.

　　对：This setup is better than the one at the main office.

　　8. Lay 和 lie

　　错：I got dizzy and had to lay down.

　　对：I got dizzy and had to lie down.

　　对：Just lay those books over there.

　　9. Then 和 than

　　错：The accounting department had more problems then we did.

　　对：The accounting department had more problems than we did.

　　注：当一个句子以 If 开头时，你并不需要接着来一个 then，Then 完全是多余的：

　　错：If you can't get Windows to boot, then you'll need to call Ted.

　　对：If you can't get Windows to boot, you'll need to call Ted.

　　10. Could of, would of 和 could have, would have

　　错：I could of installed that app by mistake.

　　对：I could have installed that app by mistake.

　　错：I would of sent you a meeting notice, but you were out of town.

　　对：I would have sent you a meeting notice, but you were out of town.