英语中名词的前面是主语，后面是宾语这样理解对吗？，是一定的吗?

Answer 1

Hi! Nice to answer your question.
I don't think your understanding is right.

要了解主语和宾语，必需要了解简单句的五种基本句型：

1. 主谓结构；
2. 主系表结构；
3. 主谓宾结构；
4. 主谓双宾结构；
5. 主谓宾＋宾补结构

从五种基本句型不难看出：主语和谓语是一个句子的基本成分；要有宾语，必须要有谓语，构成动宾结构（动词＋宾语）。当然，英语中还有介宾结构（介词＋宾语）。

一个句子中，充当主语的往往是：①名词，②代词，③动名词，④动词不定式，⑤主语从句，⑥其它名词性质的结构。 e.g.

① China is a great country. （名词China作主语）
② She is an English teacher. (代词She作主语)
③ Learning English is interesting.(动名词短语Learning English作主语)
④ To see is to believe. (动词不定式To see作主语)
⑤ That you are interested in English is certain.
(主语从句That you are interested in English作主语)
⑥ The rich are helping the poor. [名词性质短语The rich(富人)作主语]

同理：一个句子中，充当宾语的往往是：①名词，②代词，③动名词，④动词不定式，⑤宾语从句，⑥其它名词性质的结构。 e.g.

① I love China. (名词China作动词love的宾语)
② He loves her. (代词her作动词loves的宾语)
③ She likes learning English.
(动名词短语learning English作动词likes的宾语)
④ He begins to read English aloud at 6:30 a.m. every day.
(动词不定式短语to read English aloud at 6:30 a.m. every day作动词 begins的宾语)
⑤ I think that you are interested in English.
(宾语从句that you are interested in English作动词think的宾语)
⑥ Do you want to help the poor? [名词性质的短语the poor(穷人)作为help的宾语]

再举两个介宾结构的例子：

① We study for ourselves. (反身代词ourselves作介词for的宾语，构成“介宾结构”)

② This e-mail is from Jim. (名词Jim作为介词from的宾语，构成“介宾结构”)

Answer 2

英语句子结构：主语+谓语+宾语
例如：I am a student.
I是主语，am为谓语，a student是宾语
I can swim.
I是主语，can是谓语，swim是宾语
当然这些只是句子结构比较简单的句子，复杂的句子中还有状语，定语，双宾语等。

Answer 3

主语＋动词＋宾语

主语及宾语都是名词

基本上是，当然有些例外