1. 用作名詞，表示“經驗”“體驗”，是不可數名詞；而表示“經歷”“感受”，通常是可數名詞。如：
Experience is the best teacher. 經驗是最好的老師。
I know from experience that he will arrive late. 據我的經驗，他會遲到的。
He had many interesting experiences while travelling inAfrica. 他在非洲旅行時，有很多有趣的經歷。
表示做某事的經驗，其後通常不接不定式，而接 in [of] doingsth。如：
He has had many years’ experience in [of] wheat planting / planting wheat]. 他有多年種小麥的經驗。
He has had much experience in [of] this kind of work. 他有豐富的經驗做這項工作。
比較：experiece in [of] teaching＝teaching experience(教學經驗)
2. 用作動詞，表示“體驗”“經歷”等，只用作及物動詞。如：
The child had never experienced kindness. 這孩子從未受過善待。
He experienced great hardships for the first time in his
life. 他有生以來第壹次體驗到巨大的艱苦。
註有時其過去分詞用作形容詞。如(from www.yywords.com)：
He’s quite experienced in [at] teaching beginners. 他在教初學者方面很有經驗。
Even experienced teachers can make mistakes. 即使有經驗的教師也可能犯錯誤。