Learn Hardcore Korean: inteoneseseo yeonghwareul bwayo.

Korean often drops the subject when it’s obvious from context. In this sentence, 저 or 나 (“I”) is implied, so it really means “I watch movies on the Internet.” Depending on context it could also imply “we,” “they,” or “you,” but most naturally it’s first-person.

Why is 인터넷 followed by 에서 and not 에?

The particle 에서 marks the location where an action happens. So 인터넷에서 literally means “at/on the Internet,” i.e. the place you’re watching from. In contrast, 에 alone can mean “to” (direction) or “at” (existence), but doesn’t emphasize an ongoing action.

Could I say 인터넷에 영화를 봐요?

Using 에 here would sound off, because you’re not just existing on the Internet—you’re performing the action of watching there. Stick with 인터넷에서 for “watching on the Internet.”

Why is 영화 in the form 영화를?

영화 means “movie.” It’s the direct object of 보다 (“to watch”), so you add the object particle 를. Since 영화 ends in a vowel, the particle is 를, giving 영화를.

Why is the verb conjugated as and not ?