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5. This is not easy and (this) may require two porpoises…
并列句，首句为主系表结构，后句省略了主语，为主谓宾 宾补结构.
6. the first porpoise swoops down…and butts…
并列复合句，主句为主谓宾结构，后句省略了主语.
as 引导的时间状语从句为主谓结构.
7. This knocks down the turtle…
简单句，主谓宾结构，谓语由动词词组担任.
8. He recovers his equilibrium than the next porpoise comes along and hits…
复合句，主句主谓宾结构.
从句为并列句，主谓宾结构，第二句省略了主语，(the next porpoise) hits him another crack 双宾语，him 为间接宾语，another crack 为直接宾语.
这里是 no sooner…than 结构的时间状语从句，语法上，主句用过去完成时，从句用一般过去时. 本句可写作：No sooner had he recovered his equilibrium than the next porpoise came along and hit him another crack.
9. the turtle has been butted…
简单句，主谓结构.
10. He is satisfied to try… but a porpoise knocks him…
并列复合句，but 分成前后两句.
第一句为主谓宾结构.
第二句为 as soon as 引导的时间状语从句，以及主句为主谓宾 宾补结构.
11. The turtle gives up and the game is over…
并列句，第一句主谓结构，第二句主系表结构.
