Do not start from page one if you already know basic pronouns. Flip through the table of contents, identify areas where you frequently hesitate, and start there.
: Exercises are organized into units that progress logically, starting from basic verb tenses and parts of speech to more advanced structures like conditionals, passive voice, and modals. Functional Examples
Defining vs. non-defining clauses are distinguished through comma usage alone. Non-native speakers frequently misuse "which" and "that"—this chapter solves that problem with three simple tests.