A bear goes over the river.
I can see a bear go over the river.
Are the sentences above correct? If the sentence has "can", goes will become to go?
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As Glorfindel noted, this is due to see, not because of can. This is a common construction in English. Other verbs that have the same effect include observe, watch, hear, feel.
There's a good explanation here: http://dictionary.cambridge.org/grammar/british-grammar/verb-patterns/hear-see-etc-object-infinitive-or-ing