1。 注意以下兩個基本用法，許多其他用法和搭配均可從這兩種基礎引申出來：
(1)表示“反對”“對著”“違反”“不利於”等。
We are all against his idea。
我們都反對他的想法。
He was married against his will。
他結婚是有違本意的。
He spoke against the new law。
他發言抨擊新法律。
There were 20 votes for him and 12 against him。
有20票贊成他，12票反對他。
(2)表示“靠著”“頂著”“迎著”“襯著”等。
He stood with his back against the door。
他背靠門站著。
He hit his head against the window。
他的頭撞到了窗戶上。
It is difficult to see anything against this bright light。
對著這種強光很難看到任何東西。
Bright red flags flow in the wind against the blue sky。
鮮豔的紅旗映著藍天迎風飄揚。
2。 注意 against是介詞，不是動詞。
他靠在樹上。
正：He leaned against the tree。
誤：He against the tree。
這個計劃你是贊成還是反對呢？
正：Are you for or against the plan？
誤：Do you support or against the plan？
3。 正因為against是介詞，所以後接動詞時要用動名詞。
我反對在警察到達之前採取任何行動。
正：I‘m against doing anything till the police arrive。
誤：I’m against to do anything till the police arrive。
