You can go out on the weekends but during the week it, you know, it should be study time.
( You ( ( can ( go ( out ( ( ( on ( the weekends ) ) but ) ( during ( ( the week ) ( it ( ( , ( ( you know ) , ) ) ( it ( should ( be ( study time ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (MD can) (VP (VB go) (PP (RB out) (PP (IN on) (NP (DT the) (NNS weekends))) (CC but) (PP (IN during) (NP (NP (DT the) (NN week)) (SBAR (S (NP (PRP it)) (PRN (, ,) (S (NP (PRP you)) (VP (VBP know))) (, ,)) (NP (PRP it)) (VP (MD should) (VP (VB be) (NP (NN study) (NN time))))))))))) (. .)))
Don't go out during the week: it's best to keep the weekdays for studying, and let your hair down at the weekend. 
( ( ( ( ( Do n't ) ( ( go out ) ( during ( the week ) ) ) ) : ) ( it ( ( 's best ) ( to ( ( ( ( ( keep ( the weekdays ) ) ( for studying ) ) , ) and ) ( ( ( let ( your hair ) ) down ) ( at ( the weekend ) ) ) ) ) ) ) ) . )
(ROOT (S (S (VP (VBP Do) (RB n't) (VP (VB go) (PRT (RP out)) (PP (IN during) (NP (DT the) (NN week)))))) (: :) (S (NP (PRP it)) (VP (VBZ 's) (ADJP (JJS best)) (S (VP (TO to) (VP (VP (VB keep) (NP (DT the) (NNS weekdays)) (PP (IN for) (S (VP (VBG studying))))) (, ,) (CC and) (VP (VB let) (NP (PRP$ your) (NN hair)) (PRT (RP down)) (PP (IN at) (NP (DT the) (NN weekend))))))))) (. .)))