$1.$ Although the boy looks thin, he is very strong.
$2.$ This problem couldn't be solved.
$3.$ Would you might if I borrow your pen?
$4.$ The film was so boring that I fell asleep.
$5.$ Henry wished she bought the second hand car.
$6.$ Because of her sickness, she didn't go to school yesterday.
Chúc bạn học tốt!