THOMSON AND MARTINET’S CLASSIC INTERMEDIATE GRAMMAR FOR FOREIGN LEARNERS IS THE MOST WIDELY USED BOOK OF ITS KIND. IT IS POPULAR BECAUSE ITS EXPLANATIONS ARE CLEAR AND BECAUSE IT DEALS THOROUGHLY WITH THE TOPICS WHICH STUDENTS FIND MOST DIFFICULT. A PRACTICAL ENGLISH GRAMMAR HAS NOW BEEN REVISED AND REISSUED IN A FOURTH EDITION. THE TEXT HAS BEEN REWRITTEN IN MANY PLACES TO BRING IT UP TO DATE. SOME MATERIAL HAS BEEN REARRANGED TO MAKE IT SIMPLER FOR THE READER TO COMPARE RELATED TOPICS