Barron\'s ESL Proficiency Series: Prepositions provides comprehensive coverage of this most difficult topic in English grammar.
An answer key is included in the bac.
Content is organized into simple 15-minute units each of which has its own practice exercises.
Jean Yates offers clear explanations with lots of examples and opportunities to practice.
The idiosyncratic nature of Prepositions often makes them a barrier to achieving English language proficiency.
Barron\'s ESL Proficiency Series: Prepositions provides comprehensive coverage of this most difficult topic in English grammar