Fishermen and sailors sometimes claim to have seen monsters in the sea.
| to see 不定式 | to have seen 不定式的完成式结构（发生时间更早） |
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| 不定式的完成式用于不定式的动作发生在谓语动作之前的情况，不定式的完成式常用于 believe，declare，find，say，see，know，think，understand 等动词之后（这些动词常用被动语态） | |
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* Though people have often laughed at stories told by seamen, it is now known that many of these 'monsters' which have at times been sighted are simply strange fish.
at times 有时，偶尔
- At times I feel that he is not honest.
it is ... + that 主语从句、非强调句(强调名词与从句不能不能强调形容词、动词)
| have been sighted 过去被看见(过去完成时被动) | is known 现在被知道(一般现在被动) |
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| It is known that ... 'monsters' which have ... been sighted are simply strange fish. Fish is known. 鱼被知道。 | |
Occasionally, unusual creatures are washed to the shore, but they are rarely caught out at sea.
occasionally adv. 偶然，偶尔 = sometimes adv.有时
- I have a manicure occasionally. 我偶尔会做一次手甲护理。
out at sea 在远海，在外海
- Don’t sail out to sea in this weather.
Some time ago, however, a peculiar fish was caught near Madagascar.
| some time ago 在过去的某个时间点 | In Some Time Ago 在不久前 |
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| Some time ago, I visited Paris and fell in love with the city.在过去的某个时间点，我去了巴黎并爱上了这座城市。 | A short time ago, a test was given in some places. 不久前，在一些地方进行了一次测试。 |
Realizing that this was no ordinary fish, the fisherman made every effort not to damage it in any way.
| no + 名词 | not + 动词 |
|---|---|
| no ordinary fish 不寻常的鱼 | not to damage it 不要伤害它 |
| no 的否定意味比 not (a/an)要重（用于名词或形容词之前、系动词 be 之后） | |
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The fish, which has since been sent to a museum where it is being examined by a scientist, is called an oarfish.
The fish (非限制性定语从句做插入语) is called an oarfish. 这种鱼被叫做桨鱼(皇带鱼)。
| 插入语分解(进一步说明鱼当前的情况) | |||
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| 非限定定语从句 | 现在完成时被动(被送去了博物馆) | 定语从句 | 现在进行被动(正在被科学家检查) |
| Which | has since been sent to a museum | where | it is being examined by a scientist |
Such creatures have rarely been seen alive by man as they live at a depth of six hundred feet.
creature 指包含人在内的“生物，动物”
- The poor creature has suffered a lot during that time. 指人时它可以表示怜爱等感情，多用于指女性