A sentence with 1 verb needs the word
"do/does" or
"did" to make a question. Let's look at some sentences:
I work at Mc Donalds (tegw. tijd)
I walked home yesterday (verl. tijd)
You can't say: "Work I at McDonalds?" or "Walked I home yesterday?"
You need to include "Do"(tt) or"Did"(vt) before the whole verb(voor hele ww).
Do I work at McDonalds?
Did I walk home yesterday?