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Which expression is better, and which is right, and why?

A. Sorry to disturb you at weekend.
B. Sorry to disturb you on weekend.

C. Sorry to disturb you at weekends.
D. Sorry to disturb you on weekends.

E. Sorry to disturb you at the weekend.
F. Sorry to disturb you on the weekend.

G. Sorry to disturb you at the weekends.
H. Sorry to disturb you on the weekends.
Comments  
F. Weekends are usually referred to with an article. Also, usually days are referred to with "on"; time with "at".

However, if A calls B every weekend, s/he might later apologize for it using H. It would be uncommon but technically accurate.

E. Sorry to disturb you at the weekend.

Students: Are you brave enough to let our tutors analyse your pronunciation?
unimousWhich expression is better, and which is right, and why?
A. Sorry to disturb you at weekend.
B. Sorry to disturb you on weekend.
C. Sorry to disturb you at weekends.
D. Sorry to disturb you on weekends.
E. Sorry to disturb you at the weekend.
F. Sorry to disturb you on the weekend.
G. Sorry to disturb you at the weekends.
H. Sorry to disturb you on the weekends.
anonymous
unimousWhich expression is better, and which is right, and why?
A. Sorry to disturb you at weekend.
B. Sorry to disturb you on weekend.
C. Sorry to disturb you at weekends.
D. Sorry to disturb you on weekends.
E. Sorry to disturb you at the weekend.
F. Sorry to disturb you on the weekend.
G. Sorry to disturb you at the weekends.
H. Sorry to disturb you on the weekends.

The UK uses "weekend" differently from the US. In the US, only D and F are right. There is no reason. H is barely possible in an unusual situation.