how many problems ....

what are empirical problems.

salient findings 

adults are unable to .......(bad accent)

reach the likability..

success vs faliure.

learners produce ....

   autonomous sytax(not depend on L1 L2) 

learners do not...

1:

why adult can not....

bad accent ？

why dramatic accent？

why are unable to reach  

salient findings 

success vs faliure

autonomous sytax

grammatic construction  does not e*st in both L1 L2

(MARrry is the women who stole the car

negation..

before the verb

after the verb (j)

studies:

no 

do not like 

mustnot....

cannot

interesting