Then they ask the students in the other school to measure and report back the length of a shadow of a vertical stick at true noon.
(they; ask; the students in the other school; to measure and report back the length of a shadow of a vertical stick at true noon; T:Then) (the students in the other school; to measure; ) (the students in the other school; to report; back; the length of a shadow of a vertical stick at true noon)
they the students in the other school the students in the other school
ask to measure to report
the students in the other school to measure and report back the length of a shadow of a vertical stick at true noon T:Then
back the length of a shadow of a vertical stick at true noon