- 6 2 2 . ▁B ing ley , ▁UK : ▁Emer ald s ▁Group ▁Publishing ▁Ltd . ▁ ▁Bh att , ▁R akes h ▁M . ▁( 1 9 9 5 ). ▁" Code - switch ing ▁and ▁the ▁functional ▁head ▁constraint ". ▁In ▁Jan et ▁Full er ; ▁et ▁al . ▁Pro ceed ings ▁of ▁the ▁Ele vent h ▁Eastern ▁States ▁Conference ▁on ▁L ingu istics . ▁I th aca , ▁NY : ▁Department ▁of ▁Modern ▁L anguages ▁and ▁L ingu istics . ▁pp .   1 – 1 2 . ▁ ▁B ok amba , ▁E y amba ▁G . ▁( 1 9 8 9 ). ▁" Are ▁there ▁s ynt actic ▁constraints ▁on ▁code - mix ing ? ". ▁World ▁English es . ▁ 8 ▁( 3 ): ▁ 2 7 7 – 9 2 ▁ ▁Cant one , ▁K . ▁F .; ▁Mac Sw an , ▁J . ▁( 2 0 0 9 ). ▁" The ▁syntax ▁of ▁D P - internal ▁codes w itch ing ". ▁In ▁Is ur in , ▁L .; ▁Win ford , ▁D .; ▁de ▁Bot , ▁K . ▁Mult id is cipl inary ▁Appro aches ▁to ▁C odes w itch ing . ▁Amsterdam : ▁John ▁Ben j am ins . ▁pp .   2 4 3 – 2 7 8 . ▁ ▁Jos hi , ▁A rav ind ▁( 1 9 8 5 ). ▁" How ▁much ▁context - sens itivity ▁is ▁necessary ▁for ▁assigning ▁struct ural ▁descri ptions : ▁Tree ▁ad