Is the word "work' considered as a countable or uncountable noun?
For example, which one of the following sentences are correct?
1) I have an urgent work.
2) I have urgent work.
In this context, it's uncountable, so it's "I have [some] urgent work [to do]".
However, "work" can be a countable noun. For example, "the works of Shakespeare".
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.