Spelling issue

[numberland]

How do I explain why using 'baseis' as a plural of 'basis' is just wrong to one of my lecturers? Other then just saying it's not a choice, the English plural is 'bases'...

Comments

[numberland.livejournal.com]

This is because I've been correcting the notes and included this as a correction which he then disagreed with. Not a big deal, mainly just was trying to work out how to respond and unsure whether I ever would.