Question

我要是早点动身就赶上火车了．

误：If I left a little earlier, I would have caught the train．

正：

Answer 1

答案：If I had left a little earlier, I would have caught the train．
解析：

在表示与过去事实相反的虚拟语气结构中，条件状语从句需用过去完成式(had＋过去分词)，主句则用should, would, could或might＋have＋过去分词．