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现在完成时→站在现在看过去（快递已到你家但没拆）
• I have eaten 5 hot dogs.（现在可能还想吐）
过去完成时→站在过去看更早的过去（拆开的快递盒里还有小盒子）
• She had practiced 3 years before the show.（演出时已经练完了）
现在完成时时间轴：
过去动作→~~~~~→现在（影响持续）
→ 常用词：just/already/never/since+时间点
My phone has been dead since 9am.
过去完成时时间轴：
更早过去→~~~~~→过去某个时间点→现在
→ 常用词：by the time/when/before+过去式
By the time I arrived, the pizza had gone cold.
① 时间状语乱入：
× I had finished homework now.
√ I have finished homework now.
② 双动作顺序混淆：
× When I arrived, the meeting has started.
√ When I arrived, the meeting had started.
③ 虚拟语气偷袭：
If I had known earlier...（过去完成时表后悔）
1. 网购测试法：
• 现在完成时：快递显示"已签收"（但你还没拆）
• 过去完成时：快递显示"已签收"，而你拆开发现里面还有赠品
2. 侦探破案法：
现在完成时：The killer has left fingerprints（线索现在还能用）
过去完成时：The killer had wiped prints before fleeing（侦探来时痕迹已消失）
• 现在完成时：My brain has switched to 省电模式 since Monday.
• 过去完成时：I had memorized all the words before I found the exam canceled! 记住口诀：
现在完成时，现在有联系
过去完成时，过去的过去
（附赠手势：左手比"现在"，右手在背后比"过去"✌️）
