Vents and trenches: tubeworms, iron snails, the Challenger Deep and life without sunlight, sentence 12

Before vents were found in 1977, scientists thought all life on Earth depended on sunlight; some scientists now think life on Earth may have started at vents, but nobody knows for sure.

Who acts: scientists, life, nobody · What happens: find, think, depend, start, know · To what, where: vents, 1977 · Speech: someone speaks here

This is a sentence of the lesson «Vents and trenches: tubeworms, iron snails, the Challenger Deep and life without sunlight» of the biology course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (scientists, life, nobody), what happens, when and where, as Mova's frames read it from the tree.

The tree

Pragmatics

form

statement

act

narrate

voice

narrator

polarity

none

teacher

kept the draft

One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

This page in Markdown → https://md.mova.elamur.ai/free/en/corpora/school/biology/177-vents-and-trenches-tubeworms-iron-snails-the-challenger-deep-and-life-without-sunlight/12/