Hi Ashraful, Both of these would be understood by a native speaker, but it's not something we would say. "To the level" isn't a standard English expression, but you might see variations of this where "level" is used to mean "standard". In this dictionary entry (https://www.merriam-webster.com/dictionary/level), this is the 5th meaning of the word: * "a position in a scale or rank (as of achievement, significance, or value)" -- "funded at the national level" -- "the job appeals to me on many levels" Your first sentence might be: "It's very important to learn the language to a level where you can be understood." In other words, "Your standard/quality needs to be good enough that people can understand you." "He speaks English to an advanced level." / "His English is of a very high quality." For your second sentence, you would probably just use "until": "I have to work out at least until I look good." I hope that helps!

both are correct and sound natural