Giant reptiles of the past: Titanoboa, Sarcosuchus, Deinosuchus and giant tortoises, sentence 5

Scientists often have only a few bones, so they compare them with living animals to guess the size, and they honestly say «we don't know» when the clues run out.

Who acts: Scientists, we, clues · What happens: have, compare, guess, say, not know, run out · To what, where: few bones, bones, size · Speech: someone speaks here

This is a sentence of the lesson «Giant reptiles of the past: Titanoboa, Sarcosuchus, Deinosuchus and giant tortoises» 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, we, clues), what happens, when and where, as Mova's frames read it from the tree.

The tree

Pragmatics

form

statement

act

assert

voice

narrator

polarity

none

teacher

changed polarity=none

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.

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