"Come" and "go" can be confusing. Do you know how to choose "come" or "go"?

To choose "come" or "go" naturally, you should think about two cases:

1. The location of the speaker, or the hearer;
2. Joining in. 

This will help you speak English naturally.

1. The speaker's, or hearer's, location

When we talk about moving to the place a speaker or a hearer is, we use "come".

Here are some examples:

1. "Can you come here, please?"
2. "I'll come down."

In sentence one, the speaker wants to the hearer to come to his or her location. Your boss might tell you this when they need to talk about something:

Boss: [on the phone] We need to talk about this contract. Can you come into my office, please?

In sentence two, the speaker wants to go to the hearer's location. Imagine that you live in an apartment building, and your friend is picking you up. They call you on the intercom:

Friend: Hey, I am here. Do you want me to come up?
You: No, I am ready. I'll come down.

This can be a bit strange. Think about this case. Your boss asked you to come to his or her office (sentence one), but you had to send an email. Then your phone rang. It's been some time, so your boss calls you again:

Boss: Where are you? Are you coming?
You: Yeah, sorry. The phone rang, and I had to send an email. I am coming now. 

Because you are not in your boss's office, many people say "I am going now", however, this is not natural. In English, it is natural to use "come" to say you are going to the hearer. This is a difficult point for some people.

Actually, we use "go" for other places. Most of the time, you should not use "go" for talking about the location of the speaker or hearer*:

1. "I am going to work."
2. "She went to school."
3. "They have gone to Spain for the holidays." 

Think about the situation with your boss again.  Your boss calls you and you have this chat with him or her:

Boss: Are you coming to see me?
You: Yes, I am coming now.
Boss: OK, great. And will you see that client today?
You: Yes, I am going after our meeting.

You can also use "come" when you are talking about the place the speaker or hearer will be in the future:

1. "Will you come to my house on the weekend to watch the game?"
2. "Gary wants to come to your party this Friday."
3. "I'm moving to Toronto next week. You should come and visit me there."

2. Joining in

We use "come" when we want to emphasis joining in. Even if we use "go" to talk about the original action (because you are going to another place), when we want people to join us, we use "come":

1. "We are going for a coffee at the cafe around the corner. Come with us."
2. "I am going to a meeting at 4 in the client's office. Are you coming?" 

When you are going somewhere, and you want someone to follow you, you say "Come with me, please", or "Come this way". For example, when a customer visits your office, you might meet them at reception to take them to the meeting. You can say:

"Welcome. Please come this way."