Good questions! These are called Infinitives and Gerunds. Infinitives are things like: To watch To see To swim Gerunds: watching seeing swimming Basically Gerunds act as a noun ending in the form of -ing: Stop swimming. Infinitives: Stop to swim. This link is a little bit more in-depth. it also has a quiz for you to take that will help you with the Gerunds and Infinitives. Link: http://www.ecenglish.com/learnenglish/lessons/gerunds-vs-infinitives

I do not think there is much difference between the two forms, and you could used either form correctly. If you say "I prefer watching movies" you are emphasizing that you enjoy watching movies. When you say "I prefer to watch movies" you are emphasizing your preference. For example, I would say: "I prefer to watch movies instead of documentaries." Or: "During my free time, I do not like to do house chores. I prefer to watch movies" But like I said earlier, I think you could use either form and still be correct.

Hi Ruthi, Thanks a lot, your explanation is really useful and understandable :)

Hey Syrarief I think there is no difference. There are some verbs in English that take ONLY infinitive, and some that take Gerund, and there are some that take either infinitive or gerund, and the meaning is the same- I love dancing/ I love to dance I prefer dancing/I prefer to dance Both versions are fine.