It's one of those irregular verbs that has the same form for the past tense and the past participle.
Here are some examples:
* I have let the dog out.
* He had let go of the rope.
* They were let down by their friends.
It's one of those irregular verbs that has the same form for the past tense and the past participle.
Here are some examples:
* I have let the dog out.
* He had let go of the rope.
* They were let down by their friends.