New Words：

sign [saɪn] 招牌;标牌;指示牌;标志

post [poʊst]

v. 邮寄；寄；把(信件等)投入邮筒；投递
n. 柱；桩；标志杆

Sample Sentences：

There's a big sign in front. You can't miss it.
The sign on the wall said ‘Now wash your hands’.

Could you post this letter for me?
I'll post the letter when I go out.
Do you need to post them, or just email them to you?
"Will you post this letter for me?" " No, it's too cold to go out."

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