Focus on grammar 3, Workbook, Fuchs M., 2000.
Marjorie Fuchs has taught ESL at New York City Technical College and LaGuardia Community College of the City University of New York and EFL at the Sprach Studio Lingua Nova in Munich, Germany. She holds a Masters Degree in Applied English Linguistics and a certificate in TESOL from the University of Wisconsin-Madison. She has authored or coauthored many widely used ESL textbooks, notably On Your Way: Building Basic Skills in English, Crossroads, Top Twenty ESL Word Games, Around the World: Pictures for Practice, Families: Ten Card Games for Language Learners, Focus on Grammar: A High-Intermediate Course for Reference and Practice, and the Workbooks to the Longman Dictionary of American English, the Longman Photo Dictionary, The Oxford Picture Dictionary, and the Vistas series.