319. Wrong use of "the" after whose
(X) The boy whose the father is ill has left.
(O) The boy whose father is ill has left.
Don't use "the" article after the relative determiner whose, because it takes the place of the article.
320. Wrong use of the indefinite article "a, an" before work, etc.
(X) Gillian has found a work at the bank.
(O) Gillian has found work at the bank.
Don't use the indefinite article "a, an" before such words as work, fun, health, permission.