잠도 안 자요 The following sentence 잠도 안 자고 영어 공부 하고 있어요. is translated by "I’m even trying to stay awake and I’m studying English." But I don't get why 잠도 안 자고 is translated by "I’m even trying to stay awake". I understand the 안 자요 part as "I am not sleeping" but does it get a new meaning with 잠도? (And what does it mean exactly, is it from 잠 as sleep?) Thank you for your help.

너한테 할 말이 있어 sentence 너한테 할 말이 있어. is translated by "I have something to say to you." I understand each word of the sentence but 할 (from 하다 I guess) Is it a form of adjective linked to 말이 to mean "words to (have to) say" Would 너한테 말이 있어 work and have the same meaning? Thank your for your help.

요받은 거예요 vs 받았어요 I encountered the following phrase: 그건 그 사람한테서 받은 거예요. translated by "I received it from that person" How is it different from 그건 그 사람한테서 받았어요. (if that is correct) ? What kind of verbal form is 받은 거예요? Thank you for your help.

Can you confirm that 이었어요 and 였어요 are the same?