'
to let down' means to disappoint someone.
- I promised to do it, I can't let her down.
- They let us down badly by not completing the work on time.
'
to let in' means to allow someone to enter.
- I have a front door key. I can let myself in.
- They're at the door. Can you let them in?
'
to let in' can also mean to allow water, light or air into something which is normally sealed.
- I opened the curtains to let in the sunshine.
- I need some new boots for winter. These let water in.
'
to let in for' means to be involved in something difficult or unpleasant.
- This job is very hard. I didn't realise what I was letting myself in for.
- She didn't realise how much work she was letting herself in for doing this course.
'
to let in on' means to tell someone about something which is secret.
- I don't know what they're doing. They wouldn't let me in on their plans.
- She let me in on her secret. She's getting married!
'
to let off' means to not punish someone when they have done something wrong.
- He was caught smoking in the office but they let him off because it was the first time.
- I'll let you off this time but if you do it again, you'll be severely punished.
'
to let off' can also mean to allow someone to not do something they should do.
- I owed him some money but he let me off. I didn't have to pay him back.
- I was supposed to work until 10 pm but my boss let me off at 9.
'
to let out' means to allow someone to leave a place, usually by opening a door.
- He stopped at the traffic lights to let me out.
- Let me out at the end of the road. I can walk the rest of the way.
'
to let out' means to make a particular sound.
- When she heard the news, she let out a huge sigh of relief.
- They all let out a groan when they heard the bad news.
'
to let up' means to cease or to decrease in intensity.
- We'll go out for a walk if the rain lets up.
- The pressure at work is non-stop. It never lets up.
exercise1exercise 2
exercise