on duty/guard
*在值班/警戒中
**Whitestorm promised the camp would be safe when he was on duty.

on exhibition
*在展出
**Cloudpaw felt sick seeing various kinds of cat food on display.

on fire
*着火
**Patchpelt woke up to find the whole camp on fire.

on holiday/vacation
*在度假
**Gray Wing’s friends were worried when he was on holiday in River Ripple’s camp, relaxed.

on line
*在工作（或运行）
**Everyone was busily on line apart from poor blind Longtail.

on sale
*出售/打折
**Although the new set of Warriors is on sale, LZ can’t afford to buy even a single book.

on show
*在展出
**（这种带着浓浓两脚兽气息的短语(╯‵皿′)╯︵┻━┻）How I wish to see Warriors’ spin - off products on show!

on the decrease
*在减少
**It was obvious the number of preys were always on the decrease in leafbare.

on the go
*在忙碌中
**Dustpelt kept himself on the go to get rid of sadness.

on the increase
*在增加
**As the major clan, ThunderClan’s number of warriors was always on the increase.

on the march
*在进行中
**Under Brokenstar’s leadership, ShadowClan was always on the march to attack.

on the way
*在途中
Brindleface was killed by Tigerstar on the way home.

on trial
*在受审
**Leopardstar felt scared and helpless watching her deputy on trail.

on account of
*因为
**The clans’ water source was cut off on account of beavers.

on behalf of
*代表
**Fireheart tried to calm down himself when standing on behalf of his clan at the Gathering for the first time.