English is Not Easy

A quirkily illustrated, brilliantly risqué, but thoroughly practical, guide to the peculiarities of one of the trickiest languages on earth, for (strictly adult) students of English as a foreign language and native speakers alike

Do you know when to use whether opposed to if? For exampIe, I wonder whether I should have added a little more poison to his tea? Or where to place the comma in a conditi...