( ( Liquid water ) ( ( is ( ( converted ( to ( water vapor ) ) ) ( during evaporation ) ) ) . ) )
(ROOT (S (NP (NN Liquid) (NN water)) (VP (VBZ is) (VP (VBN converted) (PP (TO to) (NP (NN water) (NN vapor))) (PP (IN during) (NP (NN evaporation))))) (. .)))
Liquid water is converted to water vapor during evaporation .
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (JJ liquid) (NN water) (NNS changes)) (VP (TO to) (VP (VB water) (NP (NN vapor)))))) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (NN evaporation)))) (. .)))
When liquid water changes to water vapor it is called evaporation.