（写作拉长句子 10<words of a sentence<25）
1. 英语很重要：
English (, a universal language throughout the world, ) is vital (although it is hard to recite these words). 同位语（这里是一个名词性质的，没有主谓宾，只有同位语从句才有噢）状语从句
throughout （prep./adv. 遍及；自始至终)
2. 我要给你推荐一个旅游景点：
I (，a undergraduate in this university, ) will recommend you a tourist a attraction (which keeps popular with Chinese travelers).
recommend （v.建议；介绍；使受欢迎）
tourist （n.旅行者；adj.旅行的； adv.坐旅游车厢）
attraction （n. 有吸引力的事物；吸引力）
tourist attraction 旅行的有吸引力的事物：旅游地
3.我们在唱歌：
While we feel quite exhausted,(状语) we, as a matter of fact（状语，事实上）, a group of vigorous university students,（同位语） who will take an important examination（定语） are singing songs, Two Tigers and If I Were a Boy,（同位语） which are so popular with our class （定语）because today is our teacher's birthday（状语）.
vigorous （adj.精力充沛的；强壮的）
