Thomson, A.J. <br/><br/>
A practical English grammar for foreign students exercises 5 : auxiliary verbs 

 - London :  Oxford Univ. Press,  1964 
 - 48 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ENGLISH LANGUAGE--TEXTBOOKS FOR FOREIGN SPEAKERS<br/>ENGLISH LANGUAGE--GRAMMAR--PROBLEMS, EXERCISES, ETC.
<br/><br/><label>LC Class. No.: </label>PE1128  / T465P