Präsens
What is happening now, habits, and plans: morgen fahre ich.
- es entzündet sich
- sie entzünden sich
to become inflamed
Weak verb, inseparable prefix, reflexive, accusative, auxiliary haben.
No ge-
The prefix never separates, and the participle takes no ge-: entzündet.
Enough to talk about now, your plans, and what you did.
What is happening now, habits, and plans: morgen fahre ich.
The everyday past in speech: haben or sein plus the participle.