Yes, the meaning is so diffrent. The second one sound so weird, and you are talking about past tense. I think you want to use the first one. And i think instead of that you can use: it's time you should go to bed.

You can also say this: Man nemitavanam keshvare khodam ra ba Iran moghayese konam, be khatere inke har keshvar zibayee va adab va rosome marboot be khodash ra darad.

"Then" its like "dann" in German. So you usually say "than" to show you want to do something after somthing else or the time line. For example: I want to go to home and then do my homework. Or. You should call your mom first and then come over. But "than" its like. "Als" in german when you want to compare. For Example : I prefer to go home than staying here. Or. I want to play a game more than doing my homework. "Than" always come with preferences

Yes, its almost the same, but dont forget that for counting we always use. Yek = one But "yeh" its like "a/an" in English.

It means everybody wants her to be with them or spend some time with them or do something with them

Easily just use untill / till It's always work. Für deine erste Setze ist richtig "up to" aber für zweite klingt es nicht gut... Einfach benutzt Untill oder till ( umgangsprache)

It means do you want cars that they worked less than 12 and half years or not. If he says yes to this question, it means he wants not really old cars, he wants cars that worked less than 12 and a half years

It means he couldn't find the information that he/she wanted, in the brochure