-tain 為動詞字尾，表”持有, 屬於”。
英文相似單字，真的很像以至於我們常常記錯意思，統整與 -tain 相似單字如下:
abstain |
v. 戒除Ten members voted for the proposal, six members voted against it, and two abstained. |
attain |
v. 達成They attained the top of the hill. |
entertain |
v. 娛樂; 款待They often entertained their friends at weekends. |
sustain |
v. 支撐If you sustain something, you continue it or maintain it for a period of time. |
contain |
v. 包含;控制The bag contained a Christmas card. |
detain |
v. 耽擱; 拘留The act allows police to detain a suspect for up to 48 hours. |
maintain |
v. 維持;保養Push yourself to make friends and to maintain the friendships. |
obtain |
v. 獲得The longer this situation obtains, the more extensive the problems become . |
