In the early days, too, longlines would have been more saturated with fish.

请求帮助分析一下这几个句子中的would have been saturated with，would not have been caught,would have been available的语法功能，是将来完成时态的被动吗，还是虚拟语气。
接下来的的几个句子：Some individuals would therefore not have been caught, since no baited hooks would have been available to trap them, leading to an underestimate of fish stocks in the past
在帮助翻译一下第一句。参考书上的翻译不太好：即译为：早些时候，用多钩长线可能会捕到更多的鱼。这样翻译逻辑不通，是不是。

early in the morning early in the morning 等于early morning in the early 1970s ------- EARLY和1970S是什么意思 关于“Early in the morning-Cliff Richard”这首歌 清早翻译成 early in the morning.和early morning都可以吗？ my parents work very hard in the farm ,they ____get up early in the morning. 翻译 Haley first discovered the orbital period of the comet in the early 1700's. In early days his clothes were so old that the colours in the material faded over the years. Even in the early morning there is no dew on the grass, and a rainfall is 为什么the late / early morning of 日期要用in啊？