be certain that –clause be certain of sth be certain to do sth .
make certain (of) 弄明白，确定
eg: a) Certain plants are good to eat but others are not .
(某些植物好吃，而另一些则不好吃。)
b) It is certain that the moon goes round the earth. ( 毫无疑问，月亮绕着地球旋转。) c) He is certain to come. ( 他肯定会来。)
d) Make certain of the rumor. (弄清楚这个谣言是怎么回事。) ▲ 注意：a certain ,a与 some 某一
a certain 表示已知但未加说明的人或物，可修饰单数复数名词或人名 some表示不确切的或说话人不愿意具体说明的人或事物，后一般不接人名 a 后常跟人名，―一个叫…的人‖
eg : a) He didn’t attend the party for a certain reason .
(由于某种原因他未参加晚会。)
b)A certain Mr Brown telephoned while you were out. (你不在家时有位布朗先生来过电话。) c) Some man at the door is asking to see you. (门口有位男子要见你。)
d) A Mr Smith is waiting for you at the door. (一位名叫史密斯的先生在门口等你。)
8. It shows the importance of wildlife protection,but I’d like to help as the WWF suggests.(这表明了野
生动物保护的重要性，不过我想按照世界野生动物基金会的建议来帮助你们。) ① as conj （在句中引导方式状语）按照，正如…那样，像…一样 eg : a) When in Rome, do as Romans do.
(入乡随俗)
b) You must do everything as I do. (你必须照着我做的来做每一件事。)
② suggest
▲ ⑴建议(to mention an idea)后接名词，动名词短语或that从句(用虚拟语气insist ,order ,command ,require ,request etc.)。 eg: She suggested going to the zoo with the child .
(她建议带着孩子去动物园。) eg: (他建议我们把工作放到明天做。)
He suggested (that) we (should) leave the work till the next day. (从句要用虚拟语气。) He suggested our leaving the work till the next day.
He suggested to us to leave the work till the next day.(后接to sb时，后面可接不定式。) ▲ ⑵ 暗示，表明 (bring sth to mind ) (从句用陈述语气) eg: His work suggests that he is a careful man .
(他的工作说明他是一个细心的人。)
The look on his face suggested that he was unhappy. (他脸上的表情说明了他不高兴。)
9. A monkey watched them as it rubbed i