For applying to Chinese Universities, and applying for a job it is important to present yourself in the correct way. It is advisable not to use informal English in applications. We see these are being used increasingly by non-native English speakers.
Such as: wanna, kinda, shoulda, gotta, gonna
Informal contractions are short forms of other words that people use when speaking casually. They are not exactly slang, but they are a little like slang.
For example, “gonna” is a short form of “going to”. If you say going to very fast, without carefully pronouncing each word, it can sound like gonna.
Please remember that these are informal contractions. That means that we do not use them in “correct” speech, and we almost never use them in writing especially for a university or job application. (If you ever see them in writing, such as in a comic strip, that is because the written words represent the spoken words or dialogue to emphasise the point that the person is speaking informally.)
In speech, we normally use them only when speaking fast and casually, for example with friends in an informal environment. Many people never use them, even in informal speech.