表時間(when~，before~，after~，till~，as soon as~)和條件(if, in case)的副詞子
句要用現在式代替未來式。
D1.子句的種類：
a.名詞子句；b.形容詞子句；c. 副詞子句
a.名詞子句：可以當主詞，主詞補語，主詞的同位語，以及受詞
b.形容詞子句：用來修飾一個名詞，常出現的形容詞子句都是關係代名詞或關係
副詞所引導的子句。
c. 副詞子句：修飾主要子句的動詞，表示動作發生的時間(when~，before~，
after~，till~，as soon as~，since~)、原因理由 (because~)、條件(if~，even if~) 、
和讓歩 (although~，though~)等等。
例：
名詞子句：
1. I don’t know when he will come back.（受詞）
2. Please tell me if (whether) he will come to my birthday party.（受詞）
3. When he will give back the money is unknown. (主詞)
4. What you will say in public is very important. (主詞)
5. The most important thing is that you have to appear on time. (主詞補語)
6. The exciting thing that he has won the first prize has already known to all of us.
(主詞的同位語)
形容詞子句：
1. Please tell me the time when the next train will come. (畫線部份的子句修飾先行
詞 the time)
2. This is the house where he lives. (畫線部份的子句修飾先行詞 the house)
副詞子句：
1. He didn’t come because he was very busy.
2. I will not come to your party because I will be out of time tomorrow.
3. Although I will be free next Sunday, I still don’t want to join the meeting.
4. If you come tomorrow, you will know who will be your partner.
5. As soon as he arrives tomorrow, I’ll ask him for help.
6. When you next see me, I will give you a present
(在所有的副詞子句中，只有表時間和條件的，才可用現在式代替未來式)
D2. 表時間和條件的 →
名詞子句：
1. I don’t know when he will go to bed.
2. Please tell me if he will buy the house.
形容詞子句
1. The time when the baseball will begin has not yet announced.
2. I don’t know the time when the class will begin.
副詞子句：
1. I will tell you the truth when you come tomorrow.
2. I will wait for him here until he comes back.
3. If he tells a lie again next time, I will punish him.
4. We will give you a big present if you let us know in advance.
5. If you visit the Taipei Zoo this weekend, don’t forget to say hello
to Harley and Patrick.
(在所有表時間和條件的子句中，只有副詞子句才可用現在式代替未來式，名詞
和形容詞子句還是用未來式。)
Exercise:
1. If it _________ (rain) tomorrow, I will not go.
2. When he _________ (come) next time, I’ll tell him to return my dictionary.
3. Because I __________ (be) very busy, I will not be able to go to your party.
4. I don’t think the time when you _________ (tell) the truth is proper.
5. I don’t know if he _________ (go) with us tomorrow.
6. If he _______ (go) to Taipei tomorrow, he will see his old friend.
Answer: 1. rains 2. comes 3. will be 4. will tell 5. will go 6. goes