They change upon compulsion, if the water grows too foul, For then they have to use their lungs, and go ashore to prowl: But when a lake's attractive, nicely aired, and full of food, They cling to youth perpetual, and rear a tadpole brood.
(a lake's attractive; nicely aired; ) (the water; grows; too foul) (They; cling; to youth perpetual, and rear a tadpole brood; T:when a lake's attractive, nicely aired, and full of food) Context(They cling,List([183, 193))):(They; cling to youth; perpetual) Context(They cling,List([183, 193))):(They; cling to rear; a tadpole brood) (they; to use; their lungs) (they; to go; ashore; to prowl)
They cling,List([183, 193)) They cling,List([183, 193))
a lake's attractive the water They They They they they
nicely aired grows cling cling to youth cling to rear to use to go
too foul
to youth perpetual, and rear a tadpole brood T:when a lake's attractive, nicely aired, and full of food
perpetual
a tadpole brood
their lungs
ashore to prowl