当你看到过去时段 例如:yesterday, last night... 就选择过去式 若只是表达一个事实 就是简单式 ex:I stayed up until 3a.m. last night 如果表达一个进行的动作就是过去进行式 While I was taking a shower, the phone rang. 注意上面例句,"通常"while後面接的是进行式when接简单式 所以上面句子= When the phone rang, I was taking a shower. 若是表示完成或是持续的或是经验 使用现在完成式(国中阶段的部份) 表示完成通常会有 already yet 这类的 ex: I haven't finished my homework yet. 持续的就像你说的有since for since加时间点 for 加一段时间 ex:I have been a high school student since last summer I have been a hight school student for a year. 经验喔 I have been to the U.S five times. 跟has gone to 比较 have been to 不一定那个人现在在那个地方 has gone to 那个人正在那里(因此绝不是说话人) e:John has gone to China.(约翰去了中国) 希望有帮助@@ --

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