Do I say えいがにみました or えいがをみました?
Thank you :D
With this class of perception verbs, the thing you are perceiving is the direct object. We mark it as a direct object using the accusative case particle を:
映画【えいが】を見ました【みました】
Other verbs in this class include 聞く【きく】 'hear' and 嗅ぐ【かぐ】 'smell'.
We would make it a direct object in English, too, by the way:
I saw a movie.
Except that in English, we mark the direct object by its position in the sentence. In Japanese, you use the accusative case particle を instead.