( ( A solution ) ( ( is ( formed ( when ( ( a ( solid ( -LRB- ( solute -RRB- ) ) ) ) ( is ( dissolved ( in ( ( a liquid ) ( -LRB- ( solvent -RRB- ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN solution)) (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (JJ solid) (-LRB- -LRB-) (NN solute) (-RRB- -RRB-)) (VP (VBZ is) (VP (VBN dissolved) (PP (IN in) (NP (NP (DT a) (NN liquid)) (PRN (-LRB- -LRB-) (ADJP (JJ solvent)) (-RRB- -RRB-)))))))))) (. .)))
A solution is formed when a solid (solute) is dissolved in a liquid (solvent).
(ROOT (S (NP (DT A) (NN solution)) (VP (VBZ forms) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN solute)) (VP (VBZ dissolves) (PP (IN in) (NP (DT a) (JJ solvent))))))) (. .)))