Zhang Liyan 
1000 Putonghua Phrases One Finds It Difficult to Pronounce [PDF ebook] 

This book divides pronunciation difficulties Cantonese meet in learning Putonghua into 10 groups. Each group is divided into subcategories by the collocation of phrases.Each group consists of 70 (or more) – 200 (or more) phrases. A total of roughly 1, 000 phrases are collected in this book, all of which have a source from the vocabulary of the national outline of Putonghua proficiency test, making this book meet the requirements of such tests as Putonghua Proficiency Test of Chinese National Language Committee, Putonghua Proficiency Test of Hong Kong Examinations and Assessment Authority, Putonghua Section of Teachers’ Language Benchmark Examination and Putonghua Section of Secondary School Examinations in Hong Kong.