The verb let means “allow”, “permit”, “not prevent or forbid”, “pass, go or come” and it's used with an object and the bare infinitive.
- Are you going to let me drive or not?
- Don't let him off the hook.
- Before we let our children surf the Internet, they have to do their homework.
- She lets the cats out before leaving.
- He let us into the house.
The full form let us can be used similarly
- Let us know as soon as possible.
- Please, let us help you.
- They will never let us forget.
None of the above can be contracted; however, when let us is used for making a suggestion; giving self-encouragement; expressing a consequence or plea, it is often contracted to let's
Let's go out
Let's have a party
Let's see what happens
Let's stand together in this emergency
Let's not forget those who sacrificed their lives
Questions
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I believe that let + us is the only instance where this type of contraction occurs. Is there an explanation as to why verbs such as (i) give + us, (ii) get + us or (iii) take + us were not similarly contracted?
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When was the apostrophe used to replace the omitted letter "u" in let us?
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What is the origin of let's?
Best Answer
It appears that the contracted form of ‘let us’, let's has acquired idiomatic meaning and usage through the years.
Let's go and let us go, may convey different meanings. Let us go in the sense of allow us to go, may not be replaced with let's.
Let's see why:
Usage note:
According to the following source:
(www.grammarphobia.com)
Etymology: