'to go down' means to get smaller or decrease.
- They are much cheaper than before. The price has gone down by at least ten percent.
- The price of laptop computers has gone down considerably over the last five years.
'to go down' can also mean be received or be reacted to.
- Everybody laughed. I think my speech went down well.
- The news didn't go down well. Everyone is now worried about their jobs.
'to go for' means to choose.
- He doesn't like spending money so he went for the cheapest option.
- We have decided to go for the house in Dunbar Street. It's lovely.
'to go in' means to enter.
- He went in his office and closed the door.
- She didn't knock on the door, she just went in.
'to go in' can also mean to fit in something.
- I've got too many clothes. They won't go in my suitcase.
- The sofa is too big. It won't go in the sitting room.
'to go into' means to describe something in detail.
- We can talk about the problem later. I don't want to go ;into it now.
- We don't have time to go into all the details.
'to go into' can also mean to enter a place.
- She often goes into that shop and tries on lots of clothes but never buys anything.
- We'll go into the sitting room. We'll be more comfortable there.
'to go off' means to stop functioning (of a light, electricity or heating).
- I was only half way up the stairs when the light went off.
- The heating goes off at midnight and comes back on before we get up.
'to go off' can also mean to stop liking someone or something.
- I used to love this café but I've gone off it since the waiter changed.
- I don't want to do it now. I've gone off the idea.
'to go off' can also mean to decay or go bad.
- I think the milk has gone off. It smells.
- Don't eat it, it has gone off.