For example, I'd say:
The interview's on Monday.
Is that grammatically acceptable?
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Yes, the contraction 's for "is" (and also for "has") is very common, particularly in speech and informal contexts; it may be considered bad style in a formal written context. For instance, using it in a conversational email would probably be considered acceptable, but in an essay or letter of complaint the full form would probably be expected.
That applies particularly to using it with:
Even in relatively formal contexts, e.g. a newspaper article, it is common to use it with:
A contraction of the verb is with a noun is found in spoken English.
These forms are not used in written English. Written English versus spoken English.
And the contraction of is to apostrophe s, as in the question here: The interview's on Monday is a perfectly respectable spoken form and would not generally be used even in informal writing, say, in an informal memo, where other contractions might be used.
Bear in mind: Spoken English can be written down!
They can be used if you are chatting online or text messaging, for instance where you are using spoken language in written form.
But don't put them in an essay, article, academic writing, questionnaire, instructions, manuals etc.
Here is an academic article on this very subject:
My answer above is intended as a non-academic response to the question. Below is an academic response to this question.
The academic article below starts with this:
The main point is: the grammar of spoken English is not the grammar of written English. The article is about that. Is states:
Teaching about talk – what do pupils need to know about spoken language and the important ways in which talk differs from writing?
It would be a mistake to assume that these forms of grammar, though common in spoken English, are exclusive to spoken English. For example, the relative immediacy of forms such as e-mail communication, advertising copy, and some notes, letters and memos means that informality is often the preferred style and that a relative symmetry of relationship is deliberately constructed by such choices.