Determiners and pronouns - one/ones

Question 1

* one (singular)
  → this one / that one
  → the one …
  → the … one
  → a/an … one

* ones (plural)
  → these/those or these ones / those ones
  → the ones …
  → the … ones
  → some … ones

Answer 1

…Which one do you want? This one.
…Which car is yours? This one or that one? (= this car or that car)
,,,A: Which hotel did you stay at?
B: The one opposite the station.
…I found this key. Is it the one you lost?
…I don’t like the black coat, but I like the brown one. …Don’t buy that camera. Buy the other one.
…This cup is dirty. Can I have a clean one?
…That biscuit was nice. I’m going to have another one
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…Which flowers do you want? These or those? or These oneS or those oneS?
…A: Which books are yours?
B: The oneS on the table.
…I found these keys. Are they the oneS you lost?
…I don’t like the red shoes, but I like the green oneS.
…Don’t buy those apples. Buy the other oneS.
…These cups are dirty. Can we have SOME clean oneS? …My shoes are very old. I’m going to buy SOME new oneS.