After and Behind

[Parabashi]

Dear Teacher,

Instead of After two days, could I say Behind two days?

And

Instead of I failed to see him in time, could I say I failed to notice him in time?



Regards,

 

[Neillythere]

As a Brit and mentor, but not a teacher, I would reply as follows:

Instead of After two days, could I say Behind two days?
No. After relates to time, behind relates to physical position.

And

Instead of I failed to see him in time, could I say I failed to notice him in time?
Yes, absolutely!

Hope this helps