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Could anybody explain me what difference between the following two sentences:
"I want a work to be done" and "I want a work done"?
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Both are incorrect because work is uncountable. Otherwise, the meanings are the same.
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Use some, not a. The following are nearly exact equivalents.

I want some work done.
I want some work to be done.
I want to have some work done.


The second above is the least elegant, in my opinion.

(Don't say, however, *I want to have some work to be done.)

If you want a countable noun, replace some work by a job in all the examples above.

CJ
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Comments  
On the same parallel....

I want some work done. ----------I want my clothes washed.
I want some work to be done.-------I want my clothes to be washed.
I want to have some work done.----I want to have my clothes washed.Emotion: smile
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