重點講解：
1. be supposed to do sth.
認為；覺得；相信；
eg. When a ladder is propped against the wall, it is supposed to be bad luck to walk underneath it.
當梯子靠墻支架時，從下走過被認為是有壞運氣。
eg. In fact, stress isn't a bad thing it is often supposed to be.
事實上，壓力并不像人們所認為的那樣是一件壞事。
2. thanks for sth./doing sth.
向…表示謝意；感謝；
eg. Thanks for all your help.
謝謝你幫我們做的一切。
eg. Thanks for inviting us, it was a lovely evening.
感謝您邀請我們度過了這樣一個愉快的夜晚。
3. used to do sth.
過去常常；過去曾；
eg. She used to work at her laptop until four in the morning.
她從前經常用手提電腦一直工作到凌晨4點。
eg. People used to recoil from the idea of getting into debt.
過去人們不能接受欠債這種事情。