Now you are in the second level Intermediary level in learning English. The first level might have introduced you to the basics of Perfect English. This section leads you to a further study of the English grammatical systems and seeks to help you build longer sentences.
Knowledge of different types of phrases, clauses and sentences and practice in the use of conjunctions will extend your ability to construct sentences.If you learn clause-analysis, it will be easy for you to understand lengthy sentences which you sometimes meet in the language of eminent writers.
Attaining knowledge of Perfect English is not only the matter of studying the basics but also taking more and more practice questions.
Let us go to the second level and take one section a day.