Do you know if they ————(go)to the zoo this Sunday if it ____(fine)?

题目

Do you know if they ————(go)to the zoo this Sunday if it ____(fine)?

答案

Do you know if they 【will go 】to the zoo this Sunday if it 【is fine】?
第一个if 引导宾语从句,根据实际状语用一般将来时
第二个if 引导条件状语从句,主句用将来时,从句用一般现在时.