phrases which are not necessary in these sentences.
Not all sentences contain unnecessary phrases.
a) My wallet has been stolen by someone.
b) We were taught by a different teacher yesterday.
c) Nick was operated on at the hospital by a doctor.
d) The meal was served by a waiter in a red coat.
e) We were shown round the museum by a guide.
f) Two letters were delivered this morning by the postman.
g) Three men have been arrested by the police.
h) Yesterday a window was broken by someone.
a. ko dung “by someone”
b. đúng
c. đúng
d. đúng
e. đúng
f. đúng
g. đúng
h. ko dùng “by someone”