What is the difference ?

[bartholomew]

1. I do it on a Sunday.

2. I do it on Sunday.

I am Polish and cannot understand the difference.

Thanx

[Grunty]

One of the grammar experts may have a different answer, but I think

1. I do it sometimes, but always on a Sunday

2. I am due to do it next Sunday

[acw]

I would say that Grunty is right. 

 

1. "I do it on a Sunday" could be an answer to a question like "On which day do you usually clean your car?"

 

2. Well, the above hypothetical question could also be answered "I do it on Sundays" (which means, "I am in the habit of doing it on Sundays" or "I usually do it on Sundays").  "I do it on Sunday", if meant in the context described by Grunty under his suggestion 2 should, of course, read "I WILL do it on Sunday". 

 

The difference is very subtle and nothing you should worry yourself about! :-)

[flaming]

Isn't 'I do it Sunday' an example of lazy speech?  'I do it Sundays'  is correct if the action is done every Sunday but even then one should say 'I do it on Sundays' 

[KTC]

"I do it on a Sunday" means that you do whatever on a any sunday

"I do it on Sunday" means that you do whatever on a specific sunday

i hope i have cleared this up a bit for you!

-ktc : )

[charliep88]

oh glory be why cant you do one on a Sunday, And one on mondayand then bobs your uncle. isnt it?

[flaming]

I'm getting my oar in again! 

acw was right in saying "I will do it Sunday" if that is the Sunday coming up, i.e. the next one. (although that would be more commonly shortened to "I'll do it Sunday").

 Also "I do it on a Sunday" is correct although that is a colloquial expression  - using the indefinite article 'a' to denote a plural,  still meaning that a person does something every Sunday. 

"I do it on Sundays" means every Sunday the thing is done, and the plural is clearly shown.