( ( ( When waves ) combine ) ( ( to ( make ( ( a ( larger wave ) ) ( ( the effect ) ( is ( called ( constructive interference ) ) ) ) ) ) ) ; ) )
(ROOT (SBARQ (WHNP (WHADJP (WHADVP (WRB When)) (JJ waves)) (NNS combine)) (S (VP (TO to) (VP (VB make) (NP (NP (DT a) (JJR larger) (NN wave)) (SBAR (S (NP (DT the) (NN effect)) (VP (VBZ is) (VP (VBN called) (NP (JJ constructive) (NN interference)))))))))) (: ;)))
When waves combine to make a larger wave the effect is called constructive interference;
(ROOT (S (NP (JJ Constructive) (NN interference)) (VP (VBZ is) (SBAR (WHADVP (WRB when)) (S (NP (CD two) (NNS waves)) (VP (VBP combine) (S (VP (TO to) (VP (VB create) (NP (DT a) (JJR larger) (NN wave))))))))) (. .)))