Learn Turkish: Parka gitmiyorum çünkü yağmur yağıyor. - I am not going to the park because it is raining.

Çünkü means "because". Just like in English, it joins a result (Parka gitmiyorum) with the reason for that result (yağmur yağıyor). In Turkish, you usually place çünkü right between the two complete sentences it connects, exactly how we do it in English.

Why is it parka and not just park?

The letter a at the end of parka is the Turkish way of saying "to the". It shows the direction of your action. Since you are talking about going to the park, you add this directional ending to the word park.

How does gitmiyorum break down into "I am not going"?

It starts with the verb root git (go). Then we add mi, which makes it negative ("not"). After that, yor tells us it is happening right now, and finally, um means "I". Put together, git-mi-yor-um means "I am not going".

Why do we use two words, yağmur yağıyor, to say "it is raining"?

In Turkish, you literally say "rain is falling". Yağmur is the noun for rain, and yağıyor comes from the verb yağmak, which is used for precipitation falling from the sky. You will see this noun-verb combination every time someone talks about the rain!