استفسارات بسيطه

[lovelyheart]

السلام عليكم
معلش انا كنت حابة اتاكد من بعض الاسئله فاتمني ان حد يفيدني

ما الفرق بين Enroll in and on
2- ANSWER TO , answer for
3- اي منهم اصح pupett show ولا doll show ??
4- can fly without engine ( glider -* shuttle )

she is a very efficient professor ,she ................. a very good uni. students
(be -have been - have - had been )

و شكرا جزيلا