Confusion with SHOULD+HAVE+PPT

[ARUK2008]

I've been working on my analysis and this is all I can think of. Any other ideas about students' confusion?

• Possible confusion with “should” when used to give advice in present. (He shouldn’t insult”)

 

[Tdol]

Some people, including some native speakers, confuse should've because of the sound and write [strike]should of[/strike].