My favorite television series is "tThe bBig bBang tTheory"."

When I started to watch it, I didn't like it because I watched the episode 10 of season 4 and I didn't know any actor,of the characters; however, my friends borrowedlent me their HBO Max account and I chose seeto watch this series again.

When I watched the first episode, I liked it, because in this series they talk about topics like engineering, physics, and astrophysics, and they always make jokes about thisese topics and. I think that I have been learning a little more about more engineering.

I am learning eEnglish by watching movies, y. Yesterday, I watched Kung fFu pPanda in English, there not were no subtitles in English, therefore I had to listen to what they spoke itaid, but I understood new words like "I figure it out" in the last scene.

I am trying to watch movies, but only the kind ofor children for, to understand more words or phrases.

(I translate this part because I don't understanding some things when I was writing in past form) ¶
- In English, when I speak in the past using negation, is it enough to just change "do" to "did" without changing the main verb?

If you mean, for example, "I do not swim" becomes "I did not swim," then yes, in past tense negation, "do" changes to "did" and the second verb stays the same. This is connected to the answer to your next question.

- Could you help me understand why sometimes, in the past or present, "to" or "ing" is added when two verbs appear together?

For example, "I like to swim" or "I like swimming" both make sense in the present tense. This is because the first verb, in this case "like," is always conjugated. However, the second verb, in this case "swim," is never conjugated. Instead, it appears in the infinitive "to swim" or it becomes a gerund "swimming", which means it acts like a noun. In your previous question, "swim" doesn't change because "do" and "did" are the first verb, and therefore "swim," as the second verb, doesn't change. However, because "do/did" are auxiliary verbs (a helping verb), they carry the tense, and the main verb (swim) always stays in the base form, not in the infinitive or gerund. This can be really confusing to explain even to native English speakers, so I hope it made sense!