「如果」

三档假设。时态往回倒一步。

如果下雨，我就不去。
If it rains, I won't go.                真会下的那种

如果我是你，就不去。
If I were you, I wouldn't go.           不是你啊

如果当时去了就好了。
If I had gone, ...                      过去的遗憾

三种档位

档位	中文感觉	英文
真的可能	明天如果下雨	If + 现在, will
假设（不真）	如果我是你	If + 过去式, would
过去的假设	如果当时……	If + had done, would have

越"不真实"，时态越往回推一步。

动手

如果你饿了，就吃吧。

✅ If you're hungry, eat.

如果我有钱，我就买。

✅ If I had money, I'd buy it.（暗示：没钱）

如果昨天没迟到就好了。

✅ If I hadn't been late yesterday, ...

要是再来一次……

✅ If I could do it again, ...

were 不是 was

❌ If I was you.
✅ If I were you.

假设句里，I / he / she 都用 were。这是老规矩（虚拟语气），考试常考。

小卡片

真可能发生    →  If + 现在时 , will
不真 / 想象   →  If + 过去式 , would
过去没发生    →  If + had done , would have

——下一课：「虽然 / 但是」。