Questions & Answers about Minä olen väsynyt, siksi minä lepään.
How does "siksi" connect to the question word "miksi" from this lesson?
Miksi means "why", and siksi is its pair, meaning "therefore" or "that is why". If someone asks a question with miksi, you often answer with siksi. For example, Miksi sinä lepäät? (Why are you resting?) could be answered with Siksi, että minä olen väsynyt (Because I am tired).
Is "väsynyt" (tired) a regular adjective?
For now, you can just treat väsynyt as a normal adjective. Later on, you will learn that the -nyt ending is actually used to create a past tense verb form, but words like this are extremely common to use just like adjectives with the verb olla (to be).
What is the dictionary form of the verb "lepään" (I am resting)?
The dictionary form is levätä. This is a Type 4 verb, which means it undergoes a pattern called "reverse consonant gradation" when conjugated. The weak v in the middle of levätä strengthens into a p when you conjugate it, making it lepään (I rest).
Do I have to say "minä" (I) twice here, or can I leave it out?
You can definitely drop minä! Because the personal verb endings in olen and lepään already tell us that "I" am doing the action, saying Olen väsynyt, siksi lepään is completely correct and often sounds more natural.