YOU SAID:

I’m going to watch a movie

INTO JAPANESE

私は映画を見るつもりです

BACK INTO ENGLISH

I'm going to see a movie.

INTO JAPANESE

私は映画を見に行くつもりです。

BACK INTO ENGLISH

I'm going to go to the movies.

INTO JAPANESE

映画に行くつもりです。

BACK INTO ENGLISH

I'm going to go to the movies.