从

从 is a Preposition, which means “from; through; via”.

Functions:

1. Generally speaking, a preposition cannot be an element of a sentence by itself.

2. Most of the prepositions have to take a noun or a pronoun to form a prepositional phrase to serve as an adverbial adjunct, complement, or attributive. For example:

Indicating the starting point: 从+Location word / Place / Position /Temporal word

1) 太阳从东边升起。

2) 他从美国来中国。

3) 我们从八点开始上课。

4) 他从家去公司。

If the object of “从” is a noun or pronoun indicating a person, it is necessary to add “这儿” or “那儿” after it to indicate place,e.g.
 

Structure:  Subject + 从 + someone（Noun / Pronoun）+ 这儿 / 那儿 +Verb + （Object）

Example，

1) 我从朋友那儿去机场。

2) 他 从 我 这儿 去 饭店。

3) 我从父母那儿 来。

3. As a preposition, 从 introduces the starting point of a period, distance, process, or ranking sequence. 从 collocates with 到 after it.

Example，

1) 我们班每天从上午九点到十点半上汉语课。

2) 从首尔到北京坐飞机需要一个小时五十分钟。