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In the following sentence:

  1. "I don't think this can be the correct answer."

If I replace "can" by "could", would it sound more correct?

  1. "I don't think this could be the correct answer."

Because I learnt that "could" has to be used when a thing can be or not be, or will be, or what sounds more logical to say about a question, considering that we never can be completely sure.

So, that choice "can" (#1) means that the speaker is absolutely certain about the answer, or is this a general affirmation?

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    Both options are grammatical, but they have marginally different meanings. What exactly are you trying to say? You say "considering that we can never be completely sure", but this doesn't actually clearly prefer once choice over the other. Concrete examples would help.
    – Esoteric Screen Name
    Dec 10, 2014 at 17:44
  • This could help you: ell.stackexchange.com/questions/27388/… @Apprentice
    – Kinzle B
    Dec 10, 2014 at 21:47
  • I forgot to say that "could" equals to "may, might" and not can in past.
    – Apprentice
    Dec 11, 2014 at 17:13

1 Answer 1

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Both of these are equally correct:

I don't think this can be the the right answer.

I don't think this could be the right answer.

The word could is the past-tense and conditional-mood form of can. Consequently, could has a softer, less-confident or less-forceful shade of meaning in situations where both words make sense.

Here are a few examples to illustrate:

  • "No one can fool me" sounds a little more certain than "No one could fool me."

  • "You can wash the dishes" is a stronger hint than "You could wash the dishes."

  • "I can save $200 a month" is more confident than "I could save $200 a month."

  • "Can you save $200 a month?" asks for a simple check of your current income and expenses. "Could you save $200 a month?" asks you to exercise ingenuity or make extra effort, if necessary, to find a way to save that much.

  • "Can you meet me at 8:00?" is a more forceful request than "Could you meet me at 8:00?" You would say "Can you…?" to a good friend, with whom you feel comfortable omitting niceties of politeness.

These are subtle differences in shades of meaning, which can't be reduced to rules. It's probably better to pick them up through experience communicating with the language than by memorizing descriptions of them. The more you use could in situations of the form "If we had X, we could do Y", the more it starts to feel softer than can, even in situations where there is no "if" or stated condition.

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