1.He is only an 11-year-old boy.这里用作形容词性的11岁的，记住用了形容词形式的，而且是加了连词符号的，不需要加复数，直接是单数形式，不然就错了。2.He was so kind that he would help me.或者He was such kind that he would help me.这里用到一个句型：so。。。that... 如此程度...以至于。或者是such...that...（到如此程度以至于）3.There is not such good thing like a free lunch.不介意的话我讲such与so 的用法。such＋a/an＋adj.＋n.或a/an＋...
