As far as I concerned if you say stain,it means some unwanted thing is on a shirt so we can remove food in 1st sentence,dirty in the 2nd . Apart from these, we can use all the sentences. I leave it to teacher to correct us.
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Vincent TeoCan I say,
(a) The food stain is on the shirt. OK.
(b) The dirty stain is on the shirt. OK.
(c)There are some stains on the shirt. OK.
(d)Ther
Vincent Teothanks. So, is there wrong to say,That would be highly unnatural.
a patch of stain ?