Learn Romanian: Tu dormi mult, dar ieși des. - You sleep a lot, but you go out often.

Both of these are Conjugation 4 verbs, which means their dictionary forms end in -i (a dormi meaning to sleep, a ieși meaning to go out). For almost all Romanian verbs, the informal singular you form ends in -i, which makes this conjugation very regular and easy to spot.

How do I pronounce the -i at the end of dormi and ieși?

It is a whispered -i. Instead of saying a full ee sound like in the English word see, you make a soft, almost silent sound that slightly changes the consonant before it. So dormi sounds a bit like the English word dorm, but said with a faint smile at the very end.

Do I have to include the word Tu at the beginning?

No, you can simply say Dormi mult, dar ieși des. In Romanian, the -i ending of the verbs already tells us exactly who is doing the action. Pronouns like tu are optional and usually only added for emphasis or contrast.

I learned that mult means much. Why is it translated as a lot here?

Mult can mean both depending on the context. When it is used right after a verb to describe an action, like dormi mult, it acts as an adverb and usually translates best as a lot in English.