Does anyone know when we should use and and when we should use and/or?
Is and/or even official English?
And when using it in conversation, do we actually pronounce "and" and "or" as such:
Hey, I would like some tuna and or salmon.
There is no official English: English is what its speakers make of it. That said, and/or is terrible English. It should be avoided, and people who use it should be made fun of. It exists because there are three ways to use the words and and or:
In the first, you must eat both your peas and your carrots. In the second, nothing prevents you from choosing steak and potatoes for dinner. In the third, you can't have your cake and eat it too.
Some people, especially lawyers, get the second and third senses confused. The argument is that because and and or are entirely different words, they should have entirely different meanings. Overlap is indicated with a slash, since "you can walk on the red and or or the blue squares" would be unacceptable.
Or means exactly the same thing as and/or. Anyone who tells you otherwise isn't speaking English. The mechanic who says
is certainly not excluding those cars that are both dented and need their oil changed. The main difference between or and and is a mild sense of contrast or indifference: "Help yourself to the cakes, the pies, and the tarts" versus "Help yourself to the cakes, the pies, or the tarts."
Still, there are some cases where or is exclusive:
Context can serve the role of saying "but not both". If your mom says "you can get the jawbreaker or the bubblegum", you know that she (wisely) won't let you have both. But if she intends to let you have both, even when context suggests otherwise, she can say:
Or, and I doubt that many will share my taste, you could try omitting the slash, as in the following:
In summary, avoid and/or and simply use or, they mean the same thing. Context will suggest the correct interpretation of or without the need to be explicit. And if context is misleading and you must be explicit, say "A or B, or both".
Breaking this down:
EDIT: To strictly answer the question, you should use A and B when you explicitly mean both A and B, and you should use A and/or B when you mean A or B (or both).
In response to a request for pronunciation, I typically treat the
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And/or is generally used when either one or both of the options may be true. Consider the following three examples:
In example #1, I am specifying that I will buy both.
As for whether it is "official English" or not, I would say that it is. It is used within the AP Stylebook, for example.
I have never seen a reference to and/or in any spoken English textbooks, and as such, when answering how it is spoken, I can only speak from personal experience. In my experience, both words are pronounced as normal, i.e. "and or".
In English "or" is usually taken to be exclusive or, if you wish to specifically use inclusive or then use "and/or".