I'm a student and I work as a driver.

We use FOR when we mention the length of the period. For example, FOR four hours, FOR three weeks, FOR a short time. We use SINCE when we mention the starting point of the period. For example, SINCE 3 o´clock, SINCE Tuesday, SINCE December, SINCE 2010.

I've got to get going. Nice talking to you! Bye! Bye! See you later/Talk to you later. Goodbye! Have a great day!

Hola Sandra, YOUR is a possessive adjective that you use before a noun to say who the noun belongs to. For example: I can't find YOUR car. She would like to buy YOUR house. YOURS is a possessive pronoun. We use a possessive pronoun without a noun, when the noun is understood. For example: Their flat is smaller than YOURS. (your flat) My dog is faster than YOURS. (your dog) Her exam was more difficult than YOURS. (your exam) Hope you can see the difference now!

I've got to get going. Nice talking to you! Bye! Bye! See you later/Talk to you later. Goodbye! Have a great day!