Was ist der Unterschied zwischen I'm concerned about und I concern und I have concerns und I'm worried und I'm worrying ?Du kannst auch einfach Beispielsätze geben.

@Rory_Lee

"I concern" isn't possible

Of your three examples, there is only "I'm concerned" and "I have concerns."

I'm concerned. Here, 'concerned' is an adjective.

I have concerns. Here, 'concerns' is a noun.

"I'm worrying" is possible but weird because worrying is an adjective that means causing anxiety about actual or potential problems; alarming.

So that means "I'm worrying" means "I am causing other people to have anxiety."

However people sometimes use 'worrying' when they mean 'worried.'

Example of worrying: This is a worrying situation.

Worried is an adjective. Worried and concerned are both adjectives and are similar.
But worried's connotation is much stronger and serious.

You didn't mention this, but 'worry' and 'concern' are both verbs.

'Concerned' and 'worried' are both adjectives and end with the suffix '-ed.'