when・before・after・if

時間和條件子句：when、before、after、if

Clauses with when, before, after, if — English grammar, junior high

接續

說明

when（當…時）、before（在…之前）、after（在…之後）、if（如果）帶出一個子句，可以放前面（加逗號）或後面。說未來的事時，子句裡用現在式代替未來式：If it rains tomorrow, we will stay home.

when, before, after and if start a clause that can go first (with a comma) or second. For the future, the clause uses the present, not will: If it rains tomorrow, we will stay home.

注意事項

• 主要子句照樣用 will：I'll call you when I arrive.
  The main clause still uses will: I'll call you when I arrive.

常見錯誤

• ✗ If it will rain tomorrow, we will stay home.
  ✓ If it rains tomorrow, we will stay home.
  if 子句用現在式表示未來。
  The if clause uses the present for the future.
• ✗ I'll call you when I will get home.
  ✓ I'll call you when I get home.
  when 子句也用現在式。
  The when clause uses the present too.

例句

練習

在 Hanabiの小天地 聽例句的錄音、做 3 題練習，答對 2/3 就算學會，進度會記下來。