问题
选择题
Frank _____ to see his grandma if he _____ free tomorrow.
A.will come ; will be
B.comes ; is
C.will come ; is
D.is; come
答案
答案:C
if引导的条件状语从句遇到将来通常用一般现在时来表示,故本题后空应用is,本题的含义是如果明天他有空,他将来看奶奶,主句表示将来,要用将来,用will加动词原形,故选C。