下面这几个英语句子语法正不正确?

题目

下面这几个英语句子语法正不正确?
"Let's suppose that the cat is male,the dog female and the bird male."
"Let's suppose the cat to be male,the dog femail and the bird male."
"...,where f(t) is a continuous function,and g(t) a function with lower bound m."
“Let g be the acceleration of gravity,theta the angle subtended by the rod and the vertical axis through the pivot point,and k the coefficient of friction of the joint.”
我的问题是,后面并列的从句部分的谓语能不能像这样省掉?比如说第一、二句中的dog和bird后面省了is,第三句中的 g(t) 后面省了is,第四句中的theta和k后面省了be.

答案

"Let's suppose that the cat is male,the dog female and the bird male."
"Let's suppose the cat to be male,the dog femail and the bird male."
"...,where f(t) is a continuous function,and g(t) a function with lower bound m."
“Let g be the acceleration of gravity,theta the angle subtended by the rod and the vertical axis through the pivot point,and k the coefficient of friction of the joint.”
并列的从句部分的谓语,因为是同一个词,所以必须像这样省掉