I am working right now and I am the hiring guy for my store. My employee pages me and says:
1. Jack please come to the customer service area for (a/the) interview. (Is this correct without the determiner? If, so why?)
2. Jack please come to the customer service area for an interview. (I know this is correct, but this is not what I am trying to say. I am trying to tell Jack to come here and interview this person.)
(1) a determiner is needed. 'Interview' is a singular countable noun, which always takes an article, a demonstrative adjective, or a possessive.
(2) It can mean either, and it is fine for your purpose, because the character 'Jack' knows that,as the hirer, he gives the interviews, not undergoes them. Don't forget how important context always is for language interpretation.
1. Who wants to go on the trip for discount? (Is this correct? If not, why? Can 'discount' be uncountable? If I want it to be uncountable is this correct?)
2. Who wants to go on the trip for (a/the) discount? (If this is correct, why? Why do I need to use a determiner?)
3. I want five slices of apple. (I don't have to use a determiner bwetween 'of' and 'apple'? Why is #1 incorrect and #3 is correct?)