Anderson Braga Mendes from Brazil asks: I am an English teacher in Brazil and I am in doubt as regards the use of the suffix -al. For example, in the sentence: ‘The Electrical Sector plans new m ...

When you add a suffix to a word ending in 'fer' you sometimes need to double the 'r', but how do you know when? When you add a suffixes and the second syllable of the new word is stressed ...