"Is that pot made of plastic?"

Translation: Ĉu tiu poto estas el plasto?

[salivanto]

Kial "Ĉu tiu poto plastas?" estas malprava?

First - plast- is a noun root, not an adjective root.

Second - there is no general rule which says you can turn adjectives into verbs anyway. See link.

[salivanto]

Link: https://blogs.transparent.com/esperanto/adjectives-love-em-leave-em/

[KainHaart]

Kial "Ĉu tiu poto plastas?" estas malprava?

[stephbutler19]

I put "estas" first, before pot, and got it wrong. "Cxu tiu estas poto (is the pot) el plasto?"

[PatriciaJH]

That's "Is that one a pot made of plastic?"

[Wuterberg]

Why tiu and not tio? Is 'pot' considered as a person?

[DavidLamb53073]

I know this post is two years old, but I feel it is an important point. The difference between "tio" and "tiu" is not that one refers to an inanimate object and the other to a person. Rather, "Tio" is used what the thing is is not specified: "That is useful" for instance, which in Esperanto would be "Tio estas utila". But here, we are told what the ting is - it is a pot - so "tiu" is used. "Tiu poto" means "that pot".

[DanielKnis1]

Why not "Cxu tiu poto estas farista de plasto?"?

[hugoxrosa]

I guees you mean "Ĉu tiu poto estas farita el plasto?"

Esperanto uses 'el' prepozicio to indicate material of.

[water_color]

Because "de" means possession, not material. In Esperanto we say "made from" or rather "is from"

[SheilaLind3]

Wouldn't that translation be "
is that pot of plastic "? Is el enough to mean "made of" in this case?

[hugoxrosa]

Yes, it is. De 'el' prepozicio is the one to indicate material something is made of.