One-to-one is used when you talk about transfer or communications. You may use one-to-one when you can identify a source and a destination. For eg., a one-to-one email is one sent from a single person to another, i.e., no ccs or bccs.
In maths, a one-to-one mapping maps one element of a set to a unique element in a target set. One-on-one is the correct adjective in your example. See Free ... "Which one is the best" is obviously a question format, so it makes sense that " which one the best is " should be the correct form.
one beer left, This is very good instinct, and you could even argue that the grammar is good, but at best it's unnatural. Regarding one hundred or a hundred etc, the person saying that there is a difference is right - one is used more for precision but a is more common and employed. 101: One hundred and one 234,500: Two hundred and thirty four thousand five hundred Based on my experience, Britons, Australians and New Zealanders say the "and", and North Americans do not (ie "one hundred one", etc). I believe most other English speaking countries say the "and". Which version was used first?
one beer left, Which came first when saying numbers: "one hundred AND one" or "one ... With one or more is / are, the first thing to consider is whether 'one or more' is a unit or analysable. It has the near-synonym 'some'; 'four or five' could be substituted reasonably by 'several'. Which is correct: "one or more is" or "one or more are"? Which one is grammatically correct or better? I have two assignments, One of them is done.
I have two assignments, One of which is done. I watched a video tutorial that the teacher said the ...
