很高兴能够在这里回答你的问题：
Don't speak English if you can't speak English well.
或
Don't speak English if you aren't good at English.
或
Don't speak English if you don't do well in English.
很高兴能够在这里回答你的问题：
Don't speak English if you can't speak English well.
或
Don't speak English if you aren't good at English.
或
Don't speak English if you don't do well in English.