Hello, I am wondering what troubles ESL students often have with using irregular plurals. Are there any journal articles on this topic?
Firstly, at lower levels, there are problems with the forms, like -en, or ones that don't change. At intermediate levels there are problems sometimes with apostrophes:
people's (this causes trouble for some as it looks singular. then you can move onto complex forms such as 'a people' and 'peoples. Or 'persons'. ;-