There is no definitive answer to this question as there are many different opinions on what constitutes advanced grammar. However, some common features that are often included in definitions of advanced grammar are:
- a greater range and variety of sentence structures
- greater use of subordinate clauses
- a greater range of vocabulary
- more use of literary and idiomatic expressions
Of course, there is no hard and fast rule that you need to use all of these features to be considered advanced. It is possible to be considered advanced even if you only use a few of them. The important thing is that you are able to use the features you do use in a precise and effective way.
If you are looking to improve your grammar and become more proficient in using advanced features, there are a number of resources that can help you. For example, many grammar books include sections on advanced grammar, and there are also a number of online resources that can be useful. The most important thing is to practice using the features you want to learn, and to get feedback from a native speaker or other proficient users of English to help you improve.
