Let’s start with a question:
أُريدُ أَنْ أذْهَبَ and أُريدُ الذَّهابَ – Does it mean the same?
Yes, both sentences mean exactly the same: I want to go.
The word ذِهابٌ is the مَصْدَر of ذَهَبَ.
You can build the الْمَصْدَر الْمُؤَوَّل by using the particles أَنْ or ما. They are a so called حَرْف مَصْدَرِيّ. Let us have a look at it:
|الْمَصْدَر الْمُؤَوَّل||=||الْمَصْدَر الصَّرِيح|
|going; go||=||going; go|
Watch out: The verb in the sentence above has a فَتْحة at the end as it is preceded by أَنْ.
Therefore, the verb has to be مَنْصُوب.