Correct wording would be: The record does not match your information. Or you could also say Your information does not match the record. The second is better said in English.

In the first sentence are you trying to say there is a team member position available? If yes - then say “There is a vacant team member position available.” If you are referring to a vacancy left by a current team member then state: “One of our team members left, leaving a vacant position.” The second sentence is correct. The third should read: We did not have internet in the past, so we hand to rush home in time to watch our favorite show.” The forth is confusing out of context. I would state it - We can communicate faster on the internet.

I would say “The loan being proposed by Citibank is still lower than any loan limit they received from HSBC.”

The proper grammar for your questions are... What is the word for.... - instead of How do you say it? And What do you say when a student does not pass to the next year in school? Also - the word choice you used is correct - Flunked. You can also simply say “the student did not pass.”

Also the correct way to ask your question is “Could you please answer this question for me?” 😊

When an abbreviation shows up in a parenthesis in a paragraph it is in reference to the words just before it. In this case AOU is an abbreviation for “allegation of use.”

The phrase you have asked about its common and correct. However, if you are looking for some alternate ways to say it you could say... "You have no to reason to worry about....(insert the thing the person is worried about)." "There is no reason to be concerned on this point..."

There is a term in intercultural work called "Code Switching". In linguistics is when a person switches back and forth between multiple languages. What you are seeing is not a "personality" change, but a culture change...specifically the culture in which they learned the language.  For example, My Italian friends are very verbose and use a lot of hand gestures and talk with their whole body - this is the nature of their culture and the environment they learned to speak.  Meanwhile, when they switch to English which they learned in a more formal setting and is, by nature culturally a bit more restrained they will often tone it down a bit.  Not talk quite as quickly or with as much body movement.  This is an example of how they "switch" from one "code" of cultural conduct to another with the simple switching of languages.