'to go about' means to deal with or tackle a task or job.
- Do you know how to enrol on the course? I don't know how to go about it.
- How can I go about getting a copy of my birth certificate?
'to go after' means to try to get.
- I sent in my application today. I'm going after that job.
- He went after a very well paid job but didn't get it.
'to go after' can also mean to follow or chase.
- Michelle left suddenly then Pierre went after her.
- I didn't go after her when she left. I think she needed to be on her own.
'to go ahead' means to begin or proceed with something.
- Even though the risks were high, we decided to go ahead with the project.
- It went ahead without any problems. We're very happy.
'to go along with' means to agree with a person or idea.
- I said it wouldn't work. I didn't go along with it from the beginning.
- In the end, he went along with Jack even though he had said he agreed with me.
'to go away' means to leave a place or a person's company.
- Did you stay at home or did you go away over the holidays?
- Please go away. I'd like to be alone for a while.
'to go back' means to return to a place.
- We had a great holiday in Spain last year. We are going back this year.
- I had forgotten my passport and had to go back to get it.
'to go back on' means to change your position on a promise or agreement.
- I said I would do it. I can't go back on it now.
- He went back on his promise and didn't help me out.
'to go by' for time means to pass
- A couple of hours went by before he phoned me back.
- Twenty years went by before I saw him again.
'to go by' can also mean to go past or pass
- I love sitting at a street café watching the world go by.
- He didn't see me. He just went by without saying a word.