虚拟语气常见四种句型 (if从句可以省略)
1) if x happens, y happens 极有可能在现在发生
2) if x happens, (then) y will hanppen 有可能在将来发生
3) if x happened, y would happen 与现在情况相反
4) if x had happened, y would have happened 与过去情况相反
happens 表示一般现在时
happened 表示一般过去时
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