Since I came to the United States

[sania-baharat]

Qid you leave the United States after applying for asylum?

A: Since I came to the United States, I have never left this country.


Would you please check the bold part for any mistakes?

 

[GoesStation]

It's OK provided context establishes that "this country" is the United States.

 

[Robbadob]

Would "ever since" work?

 

[GoesStation]

Would "ever since" work?

It doesn't really fit.

 

[Tarheel]

It's a yes or no question.

 

[emsr2d2]

Where (in which country) is this question being asked?

If it's being asked in the US, the question should be "Have you left the US since applying for asylum?"
If it's being asked outside the US, the question is pointless. For the listener to be asked the question in another country, they must have left the US.

 

[Phaedrus]

Since I came to the United States, I have never left this country.


Would you please check the bold part for any mistakes?

The bold sentence can be understood to imply that the speaker left this country when s/he came to the U.S. but has not left since.

For that reason, I recommend:

Since I have lived in the United States, I have not (once) left the country.

 

[GoesStation]

Since I have lived in the United States, I have not (once) left the country.

This demonstrates a subtle point. The definite article makes the country refer back to the United States. It might appear to a learner that this country would work the same way, but it doesn't; it sounds like the speaker means "the country I'm in right now".

 

[jutfrank]

sania-baharat—Which country do you mean by this country?

 

[Tarheel]

There is a reason I pointed out that it's a yes or no question. We would normally answer yes or no and then expand on that if we consider it necessary.

Q: Did you leave the United States after applying for asylum?
A: Yes, briefly. I took a weekend trip to Canada.

Q: Did you leave the United States after applying for asylum?
A: No. I've been here (USA) the whole time.

 

[sania-baharat]

sania-baharat—Which country do you mean by this country?

The United States.

 

[emsr2d2]

It's not natural or necessary to use "this country" at the end of your statement. However, you do need a time reference (in my opinion).

Since arriving in the United States in October 2017, I have not left.

As Tarheel said, it sounds like a Yes/No question.

Have you left the United States since claiming asylum?
No.