In this section you can practise and improve your grammar and vocabulary. There's a detailed grammar section with explanations and examples and also a quick grammar reference section. In the vocabulary section you can learn new words and listen to the pronunciation, then you can do the exercises to practise.
This grammar section explains English grammar in a clear and simple way. There are example sentences to show how the language is used and there are interactive exercises so you can practise what you learn.
This grammar reference section gives short and clear explanations. Read the explanations and then do the exercises to help you practise.