1. 應該

If you're mad at him, you should tell him directly.

如果你很不爽他，你應該要直接跟他說啊！

2. 應該（指推測）

The equipment I ordered last month for my home gym should be delivered this afternoon.

我上個月訂的轟菌器材下午應該就會送到了。

place/lay an order 下訂單

3. 萬一

Should you have any further questions, please do not hesitate to contact us.

(Should you = If you should省略if的倒裝句型，通常用於較正式的商業英文書信。)

萬一您有更進一步的問題，請不要遲疑跟我們聯絡。

hesitate (v.) 遲疑

4. 竟然

It's odd that my ex-boyfriend should think I would want to see him again.

He is the last person I want to see in the world 

真是怪了，我前男友竟然會認爲我還想再見到他。他是我在這個世界上最不願意見到的人耶！

odd(adj.) 奇怪的 = weird, strange, bizarre

at odds with 人 與⋯爭執（不合）

odds and ends 零星的東西

May the odds be ever in your favor.

願幸運女神永遠眷顧你。

The odds are slim. 

機會渺茫。

5. 竟會（用在問句why之後）

Why should anyone want to eat something so horrible?

怎麽會有人想吃這麽可怕的東西？

6. 以防(接在lest或for fear that後面)

He took aspirin in case he should get a splitting headache after the vaccine.

在接種疫苗後，他吃了阿斯匹靈以防嚴重頭痛。

lest (conj.) 以免 + S. + V.