Ser la asignatura pendiente de alguien

Ser la asignatura pendiente de alguien
 

Ej.:
El inglés es mi asignatura pendiente . ( Significa, que es algo que siempre has querido hacer, lo tomas, lo dejas, lo retomas, y al final te decides a estudiarlo, es como decir e mi espinita, y hasta que no lo aprendes no te la sacas)
English?

tengo una asignatura pendiente con ella = I have some unfinished business with her. :)

Thanks Mr PERIKLES.

So, English is my unfinished bussiness would be OK?

No. The trouble is that it does not sound quite right, and I can't think of a better expression. Just a minute - how about

English is an ongoing issue for me.
English has always been an ongoing issue for me.
I have unfinished business with English (I don't like this)

bussiness :bad: business :good: business = Busy: ocupado, apretado