let
Let is used to say that someone allows someone else to do something. After the object, you use an infinitive without to.
The farmer lets me live in a caravan behind his barn.
Her Dad never lets her have ice-cream.
They sit back and let everyone else do the work.
Be careful
Don't use a to-infinitive or an -ing form after let. Don't say, for example, ‘He lets me to use his telephone’ or ‘He lets me using his telephone’.
Don't use a to-infinitive or an -ing form after let. Don't say, for example, ‘He lets me to use his telephone’ or ‘He lets me using his telephone’.
The past tense and -ed participle of let is let.
He let Jack lead the way.
She had let him borrow her pen.
Be careful
There is no passive form of let. Don't say, for example, ‘He was let go’ or ‘He was let to go’. If you want to use a passive form, use a different verb, such as allow or permit.
There is no passive form of let. Don't say, for example, ‘He was let go’ or ‘He was let to go’. If you want to use a passive form, use a different verb, such as allow or permit.
He had been allowed to enter Italy as a political refugee.
Laurent was only permitted to leave his room at mealtimes.
‘let ... know’
If you let someone know something, you tell them about it.
I'll find out about the meeting and let you know when it is.
If the pain gets worse, let your doctor know immediately.
‘let me’
People often use let me when they are offering to do something for someone.
Let me show you.
Let me help you carry your bags.