[句型点拨]动词不定式的完成式to have done。

　　[佳句赏析]据说他已经出国了。

　　He is said to have gone abroad.

　　3．[教材原句]There have been reports of monsters in Lake Tianchi since the beginning of the last century, although no one has seen one close up.

　　自上世纪初以来，一直就有关于天池怪物的报道，尽管还不曾有人近距离目睹过。

　　[句型点拨]since与现在完成时连用。

　　[佳句赏析]自从上月以来有一些令人鼓舞的迹象。

　　There have been some encouraging signs since last month.

　　1．It often gets angry and will attack anyone who goes close to it. (P51)

　　它很容易发怒并会攻击任何靠近它的人。

　　★attack v．& n．袭击；攻击；(疾病)侵袭

　　①Attack is the best defense.

　　进攻是最好的防御。

　　attack sb. with sth.　　　　用某物攻击某人

　　be attacked with a disease 患/害病

　　make/launch an attack on/upon ... 向......进攻

　　under attack 遭到攻击

　　a heart attack 心脏病突发

　　②They started to attack each other with sharp words.

　　他们开始用激烈的言语相互攻击。

　　③Their aim was to organise joint defence if they came under attack.

　　他们的目标是在遭到攻击后进行联合防御。

　　④They made an attack on/upon the enemy.

　　他们向敌人发动了进攻。

　　2．The Grey Man is a frightening creature that lives in Scotland. (P51)

　　灰人是生活在苏格兰的一种吓人的生物。

　　★frightening adj.吓人的，令人恐惧的

　　①I will never forget that frightening experience.

　　我永远忘不了那次可怕的经历。

　　(1)frighten v．　　　　　使害怕

　　frighten sb./sth. away/off 把某人(物)吓走

　　frighten sb.into/out of doing sth. 吓唬某人做/不做某事

　　(2)frightened adj. (用于指人的感受)受惊的，害怕的

　　be frightened of ... 害怕......

　　be frightened to do ... 吓得不敢做某事

　　be frightened to death 被吓坏了

　　②The bird came to the window, but I moved suddenly and frightened it away.

那鸟儿飞到窗前，可我的身子突然一动，把它吓走了。