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7. it was found that… which…
复合句,it 作形式主语,that 引导主语从句为实际主语.
该主语从句中,含 which 引导的定语从句修饰蚊子,该定语从句为主语 双谓语结构,第二个谓语由动词词组 pass on 担任.
8. while…Australia was encouraging this one.
复合句,主句为主谓宾结构,前面为 while 引导的时间状语从句,亦为主谓宾结构. this one 指上一句的蚊子.
9. It spread the disease and reduced the population…
并列句,it 指蚊子,spread 句中为过去式,其过去式和过去分词均不变,否则一般现在时需要用第三人称单数.
10. It became apparent that rabbits were developing…so that the rabbit population was to be exterminated…
复合句,it 作形式主语,that 引导主语从句为实际主语,该从句到 disease 为止. 主句为主系表结构.
that 引导的主语从句为主谓宾结构.
so that 引导目的状语从句,该从句为主系表结构,动词不定式作表语.
11. There were hopes…that…
there be 句型 同位语从句. 其中同位语从句是主系表结构.