Let vs Let's

A reader asked about Let and Let's: What's the difference? How do you use them?

LET

The verb let means to allow or permit someone (or something) to do something. It is followed by a direct object and the base form of a verb (the infinitive without "to"), as shown in these examples: 

(The words in italics are direct objects, and the underlined words are verbs in the base form.)

• Let them go.
• I'll be happy to help you if you'll let me (help you).
• Don't let this opportunity slip away!
• His mother lets him watch TV till midnight. 
• I don't believe in letting children do whatever they want to do.

LET'S

Let's is a contraction of let + us.  (Us is the direct object.) Let's means we should (do something). 

• Let's hope for the best.
• Let's get out of here!
• Let's all remember how much we have to be thankful for.
• Let's see what's on the menu.

The expression Let's go means hurry up!

• Are you still getting dressed? Let's go! We have to leave in five minutes!

I hope this helps.