1.He is a fan of beach volleyball
*I am a fan of.....: Tôi hâm mộ cái gì
2.She is a keen on riding a bycicle around the park in the afternoon
*I am keen on...:Tôi thích cái gì
3.My grandfather needs to have a surgery for his serious heart
*S+need+to V....:ai cần để làm gì...
4.Lan has taken part in many volunteer campaigns up to now.
*participate=take part in: tham gia vào
5.They have raised funds to help disable children since early 2009.
*in→ since(thì hiện tại hoàn thành): Kể từ khi