在含有if條件狀語從句的複合句中,如果主句為下列情況,從句要用一般現在時。
(1) 主句為一般將來時
(2) 主句為祈使句
(3) 主句含有情態動詞
eg:If your head and neck still hurt tomorrow,then go to a doctor.
如果明天你的頭和脖子還痛的話,就去看醫生吧。
分析:本句是含有條件狀語從句的複合句,主句是 then go to a doctor, 從句是if your head and neck still hurt tomorrow,if是連詞,意為"如果,假如"、引導條件狀語從句。
If you need help,just let me know.
如果你需要幫助,就告訴我。
If it rains tomorrow,we won't go to the park.
如果明天下雨,我們將不去公園。
You should take a break if you are tired.
你如果累了,就應該休息一下。
-Do you think if Robert will go to the zoo tomorrow?
-I think he will go if he_____ too much homework.
A.don't have
B.won't have
C.doesn't have
解析:在含近f引導的條件狀語從句的複合句中,如果主句用一般將來時,則從句用一般現在時表將來。故選C.