1. 介系詞之結構特性：介係詞後面接名詞片語，受格代名詞或動名詞，這些都是用來做介系詞之受詞。
例：
1. Many people in Taiwan are dissatisfied(不滿意)with their living conditions.(名詞片語當with之受詞)
2. My sister is good at playing the piano.(名詞片語當at之受詞)
3. I will go out with her.(代名詞當with之受詞)
結構思考：介系詞+_____
2. 介系詞之功用：介系詞片語可以當形容詞，亦可作副詞。
例：1.The girl with a red hat is Jane.(當形容詞，修飾girl)
2.He came back in the morning.(當副詞，修飾came back)
3.The professor explained the course in detail.(當副詞，修飾explained)
4.Like his brother, Steve works hard.(當副詞，修飾後面整句)
英文文法
