文明礼貌从我做起，从现在开始，从点滴小事做起。请根据下面的提示和要求，以 “When to Say Thank You"为题，写一篇短文。

提示：⑴When should we say "thank you" at home?

⑵When are we supposed to say "thank you" at school?

⑶...

要求：⑴短文须包括提示中的两个要点和一个补充要点，可适当发挥。

⑵短文中不要出现真实的地名、校名和人名。

⑶词数80个左右。(开头已给出，不计入总词数)

参考词汇：wash, encourage, open

When to Say Thank You

    It's polite to say "thank you" when others help us or say something kind to us.