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If the sun "goes" down, why is it that I watch the sun "go" down and not watch the sun "goes" down?
Good question. When "go" is the main verb in a sentence or clause, it takes an -es in the third person singular. In this case, "go" is a bare infinitive (no "to" marker), which is never inflected. The construction
So are "I watch the sun go down" and "I watch the sun going down" the same?
BMO
Pretty much the same. In many cases there is a difference in meaning between an infinitive and a gerund, but this difference varies from very subtle to profound. In this case, there really is not an appreciable difference.
the verb go 
Linear Mode
