1. 有时其后可接介词短语。Choose a book from among these. 从这些书中选一本吧。 比较：I took it from the bed. 偶从床那儿(或床上)拿的。
I took it from under the bed. 偶从床下拿的。注意，下面一句用了 from where(引导非限制性定语从句)，而未用from which，其中的where=in the tree，即 from where=from in the tree：
He hid himself in a tree, from where he could see the enemy in the distance. 他躲在一棵树上，从那儿他可以看到远处的敌人。
2. 有时其后可接when, where引导的宾语从句(可视为其前省略了the time, the place)：He didn't speak to me from when we moved in. 从大家迁入之时起，他没和偶说过话。
基本用法1. (表示起点)从。He ran all the way home from school. 他从学校一路跑回家。Our prices start from ￡2.50 a bottle. 大家的售价从2.5英镑一瓶开始。2. (表出处、来源等)出自，来自，从…而来 This beer is imported from Mexico. 这种啤酒是从墨西哥进口的。
3. (表原因)由于，因为。They are tired out from planting the corn yesterday. 由于昨天种了一天玉米，今天他们都十分疲劳。
4.(表距离、脱离，分离)离。The house is five miles from the town. 这房子离市镇有5英里路。
5. (表原料、材料)用，由。Paper is made from wood. 纸用木材做原料。
6.(表避免、阻止、遮蔽)避免，防止，以免。 He covered his wife from the man's blows with his body. 他用身体挡住那人，从而使他妻子免遭打击。
7.(表区别、差异)由，与(…不同)。I can't tell one twin from the other. 偶分不出双胞胎中谁是谁。
8.(表判断、观点)由(…来看)，根据(…来判断)。From her looks you would say she was about twenty. 从她的模样看，你会说她约摸20岁。
9.(表根据、依据)凭，据：He played the music from memory. 他凭记忆演奏了那首曲子。
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