vergehen
to pass
The passing of time. Describes the unstoppable progression of minutes, days, or years.
Die Jahre sind wie im Flug vergangen.
The years have passed as if they flew by.

to pass / fade
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to pass
The passing of time. Describes the unstoppable progression of minutes, days, or years.
Die Jahre sind wie im Flug vergangen.
The years have passed as if they flew by.

'Vergehen' (to pass/fade) is an inseparable verb. The prefix 'ver-' always stays attached to the stem 'gehen' (to go) and often indicates that something disappears, comes to an end, or takes a negative turn.
Ich hoffe, der Schmerz vergeht bald.
I hope the pain passes soon.
To form the past tense with the present perfect, 'vergehen' (to pass/fade) is always used with the auxiliary verb 'sein' (to be), because it describes a change or movement. Using 'haben' (to have) is a common mistake.
Die Zeit ist so schnell vergangen.
Time has passed so quickly.
Pay attention to whether the verb is reflexive. Without 'sich', 'vergehen' (to pass/fade) usually means the passing of time or the disappearance of a feeling. With 'sich', it describes a negative, often criminal act.
Die Kopfschmerzen vergehen langsam.
The headaches are slowly fading.
In the meaning 'Zeit vergeht' (time passes), the verb is often combined with units of time such as 'Stunden' (hours), 'Wochen' (weeks), or 'Jahre' (years). A very common idiom is 'wie im Flug vergehen' (to fly by).
Der Urlaub ist leider wie im Flug vergangen.
Unfortunately, the vacation flew by.
In this serious meaning, the structure is fixed: 'sich an jemandem vergehen' (to assault someone). The preposition 'an' always requires the dative here.
Es ist ein Verbrechen, sich an Kindern zu vergehen.
It is a crime to assault children.
to stay / remain
'bleiben' and 'vergehen' can be opposites when talking about states, feelings, or complaints. 'bleiben' then means that something is still there or does not change. 'vergehen' means that something eases or disappears. For example, you say that pain 'bleibt' if it does not go away. If it becomes less and stops, you say that it 'vergeht'.

Die Kopfschmerzen vergehen meistens nach einer kurzen Pause.
The headache usually passes after a short break.
Nach dem Gespräch bleibt bei ihr ein unsicheres Gefühl.
After the conversation, she is left with an uneasy feeling.