There are several things you can do to prepare for the TOEFL ?Structure? section.
2. Understand Conjunctions and Linking Words, Coordinators, and Subordinators.
3. Understand Subject-Verb Agreement and Passive Voice.
4. Understand Reduced Relative Clauses and Reducing Adverbial Clauses.
5. Understand Participial Phrases and Introductory Phrases.
6. Understand Parellelism and Inversions.
7. Understand Noun Clauses and Embedded Questions.
8. Understand Parenthetical Statements, Gerunds, and Infinitives.
9. Understand Stative Passives and Prepositions.