Scheffer, Johannes <br/><br/>
The progressive in English / 
by Johannes Scheffer 
 - Amsterdam :  North-Holland,  1975 
 - xii, 397 p. :  ill. ;  23 cm. 
 - North-Holland linguistic series ;  15 .
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 363-387. 
<br/><br/><label>ISBN: </label>0444107703 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Tense