1. Get out of here!

2. Go out of here!
[Can we use both 'get' and 'go'? Are both the same? Or do we have to use 'get' here?]

3. He decided to get over his limitations.
4. He decided to go over his limitations.
[#3 is correct. What about #4? Can we use 'go' instead of 'get' here?]

[When somebody takes a bus...]
5. Get on!
6. Go on!
[#5 is correct. What about #6? They are not the same, are they?]

[When somebody leaves a bus...]
7. Get off!
8. Go off!
[#7 is correct. What about #8? They are not the same, are they?]

One and two mean the same thing. "GET out of here!" (#1) is commonly used, not "GO..."

Number three is better than number four.

Again, both are correct (five and six, seven and eight). GET is better and more commonly used.

Reed is correct ... and in #3, the two verbs mean different things, unlike in the other pairs.

Good point, Writeacher. I neglected to mention that. There is a slight, but significant, change in meaning between #3 and #4.

1. Both "get out of here" and "go out of here" are grammatically correct and can be used interchangeably in casual conversation. They both mean to leave the current location.

2. Similarly, both "get" and "go" can be used, but "get" is more commonly used in this context.

3. "He decided to get over his limitations" is the correct phrase. Here, "get over" means to overcome or move past one's limitations.

4. "He decided to go over his limitations" is not commonly used and may sound awkward. In this context, "get" is the appropriate verb.

5. "Get on" is the correct phrase when someone wants to board a bus or any form of transportation. It is a common expression used to instruct someone to enter a vehicle.
6. "Go on" is not commonly used in this context. It may sound confusing or ambiguous, so it's better to use "get on" instead.

7. "Get off" is the correct phrase when someone wants to leave a bus or any means of transportation. It is used to instruct someone to exit a vehicle.

8. "Go off" is not commonly used in this context. It may sound strange or unclear, so it's better to use "get off" instead.