Questions & Answers about Estas necese, ke la paciento revenu por dentokontrolo.
In Esperanto, estas necese is an impersonal expression meaning it is necessary.
The it in English is just a dummy subject, but Esperanto often leaves that out. So:
- Estas necese = It is necessary
- Estas grave = It is important
- Estas bone = It is good
You usually do not need ĝi here.
Necese is an adverb, while necesa is an adjective.
In Estas necese, the word describes the whole situation, not a noun. So Esperanto uses the adverb:
- Estas necese, ke... = It is necessary that...
By contrast, necesa would describe a noun:
- Tio estas necesa = That is necessary
- Necesa kontrolo = a necessary checkup
So in this sentence, necese is the normal choice.