I have so many problems to find the proper usage of defnite vs indefinite articles. Could you please see the example below and tell me if I made a mistake, and what is the proper general rule/ why the used article is wrong? This is just an example where both sentences are general rules, and it makes me really confused about the second sentence especially.
"A manager (one of many) mentioned they - according to guidelines - don't have to calibrate equipment every time they replace a water filter in a coffee dispenser. But, usually, as they replace the filter in the coffee machine the equipment calibration changes."
Ok, no problem I'll try to describe my doubts. I just don't 'feel' like they are all correct. Well, this is just a feeling and it's not very easy to explain.
- I don't feel when 'an object/or a noun(?)' is really a definite one. Is this 'a particular object' which is specified/definied or 'a word' which we'have already mentioned in the previous sentence?
- In the 1st sentence doesn't make it definite when we put 'coffee' before the word 'dispenser'?
- or, doesn't make it definite that we generally spoke about coffee machines before eg. 2 days before?
- 'the equipment calibration' as a noun mentioned for the first time in the second sentence. Why not to use 'an equipment calibration'? Also, this just sound strange to me 'an equipment calibration.
- Should we use 'the' in the second sentence because we just used both words 'filter' and 'coffee machines' or should we mean 'the same particular object(s)' in both sentences?
- Should we use undefinite or definite articles in the second sentence. This is only a very general statement, so why not to use indefinite articles (in both)?