( ( ( ( ( Shape ice ) ( into ( a ( convex circle ) ) ) ) and ) ( ( use it ) ( like ( a ( magnifying ( lens ( to ( make fire ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VP (VB Shape) (NP (NN ice)) (PP (IN into) (NP (DT a) (NN convex) (NN circle)))) (CC and) (VP (VB use) (NP (PRP it)) (PP (IN like) (NP (DT a) (VBG magnifying) (NN lens) (S (VP (TO to) (VP (VB make) (NP (NN fire))))))))) (. .)))
Shape ice into a convex circle and use it like a magnifying lens to make fire.
(ROOT (S (NP (NP (DT The) (NN lens)) (PP (IN of) (NP (DT the) (NN eye)))) (VP (VBZ is) (S (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN convex)) (VP (VB shape)))) (. .)))