Even for basic products, demand varies from day to day and week to week.
( ( Even ( for ( basic products ) ) ) ( , ( demand ( ( ( varies ( from ( day ( to ( ( day and ) week ) ) ) ) ) ( to week ) ) . ) ) ) )
(ROOT (S (PP (RB Even) (IN for) (NP (JJ basic) (NNS products))) (, ,) (NP (NN demand)) (VP (VBZ varies) (PP (IN from) (NP (NP (NN day)) (PP (TO to) (NP (NN day) (CC and) (NN week))))) (PP (TO to) (NP (NN week)))) (. .)))
Demand is always varying from day to day on products.
( Demand ( ( ( is always ) ( ( varying ( from day ) ) ( to ( day ( on products ) ) ) ) ) . ) )
(ROOT (S (NP (NN Demand)) (VP (VBZ is) (ADVP (RB always)) (VP (VBG varying) (PP (IN from) (NP (NN day))) (PP (TO to) (NP (NP (NN day)) (PP (IN on) (NP (NNS products))))))) (. .)))