1, The explorer who discovered America was Christopher Columbus.

2, Lan is unhappy that she can't go out tonight.

3, Mary isn't old enough for her to drive a car.

4, Because Nga was sick yesterday, she couldn't go to school for her EL lessons.

1.The explorer who discovered America is Christopher Columbus.

(Nhà thám hiểm phát hiện ra châu Mĩ là Christopher Columbus)

2.Lan is unhappy that she can't go out tonight.

(Lan buồn vì cô ấy không thể ra ngoài tối nay)

3.Mary is old/not old enough to drive a car.

(Mary đủ tuổi/ko đủ tuổi để lái xe)

4.Because Nga was sick yesterday, she couldn't go to school for English lessons.

(Vì hôm qua Nga ốm nên cô ấy đã ko thể đến trường để học tiết tiếng Anh)

Học tốt!