If there is only one of each, it should be 'the' in both cases.

Student or Learner
Let's assume that I describe a room to a person who doesn't see it.
1. If I say
"There's a mirror on the wall next to the sofa"
does it necessary mean that there is only one sofa in the room?
2. If I say
"There's a computer next to a fax machine"
does it necessary mean that there is more than one fax machine in the room?
I've taken these sentences from my student's book. There is one fax machine and one sofa in the picture of the room. So why different articles are used?
If there is only one of each, it should be 'the' in both cases.
Thank you for your answers.
I would like to specify that 'sofa' wasn't mentioned before. In the sentence above it is mentioned for the first time in, let say, hypothetical talk on the phone with a native speaker. I would like to know if the native speaker will draw from this 'the' the conclusion that there is only one sofa in the room.
If I understood you correctly, using 'a' in the second question doesn't exclude the sitiuation that there is only one fax machine in the room.
Am I right?
I was wondering on an inconsistent use of articles in the situation I presented: the same picture, the same exercise, the same structure of a sentence and different articles.
Dear Kateyan:
What an interesting question!
"There's a mirror on the wall next to the sofa." This sentence would imply that there is only one sofa, especially in the context you describe.
"There's a computer next to a fax machine." This sentence could mean that there are multiple fax machines in the room, but apparently it doesn't in your example.
What springs to my mind is that these sentences say something about how the speaker believes a room should be. The speaker finds it normal that there is a sofa. It's 'the' sofa that belongs in the room. However, when the speaker says, 'There's a computer next to a fax machine in the room,' s/he could mean that a computer and a fax machine are not things one would expect to find in the room; they are unfamiliar, or, at least, less personal objects
In the two sentences, 'the' can be signifying 'the familiar' and 'a' could be signifying 'an unfamiliar or unexpected object'.
Just some thoughts.
Best wishes,
Petra
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