[Eric18]

You might also get yourself a copy of Grammar Troublespots - yet another Cambridge title - which illuminates many good, or predictable, mistakes. I often recommend it to both native and non-native speakers in advanced writing courses.

Stay away, however, from the vastly over-rated Azar series.

[michèle 2]

m not a native speaker but I've found this book very useful when I started teaching English.
A practical English grammar by A.J. Thomson and A.V. Martinet
Michèle

[michèle 2]

To be honest, a sales assistant in WH Smith ( Paris ) found out this useful grammar book for me 20 years ago!!