$1.$ Mary is not young enough to join pen-friend clubs.
- S + tobe + (not) + adj + enough + to V: Đủ/ Không đủ để làm gì.
$2.$ I apologize to you for being rude to you yesterday.
- apologize to somebody for doing something: xin lỗi ai vì làm gì.
$3.$ I saw Jane who was standing at the bus stop.
- "who" là đại từ quan hệ thay thế cho "Jane".
$4.$ She gets on well with most people.
- get on with someone: có mối quan hệ tốt đẹp với ai đó.
$5.$ D. Before you going camping or fishing.
- Before + V-ing: trước khi làm gì.