I'd better run so I can make the light. 我最好在信号灯变换之前跑过去。 (1) 主语改为 We —> We'd better run so we can meke the light. (2) 用 have to...“应该……”（提示: 用 have to 替换 'd better “最好……”） —> I have to run so I can make the light. (3) make the light 改为 catch the light —> I'd better run so I can catch the light. My train pass has expired. 我的月票过期了。 (1) 改为附加疑问句 —> My train pass has expired, hasn't it? (2) 改为 when 开头的疑问句 —> When did my train pass expire? 我的月票什么时候过期了？ (3) 改为否定句 —> My train pass hasn't expired yet. 我的月票还没有过期。