[Grammar] omission of "of"

[Will17]

Hello!


Which is the right expression? :

-a couple of days or a couple days?

-She's not sure of what she wants or she's not sure what she wants.

Can we ever use "of" after "sure"?

Thanks a lot
W

 

[SoothingDave]

Not a teacher.

Any of those options are fine. They mean the same thing.

 

[Heterological]

All of your sentences are fine. You can also use the preposition "about" after "sure."