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。