Discussion of 首先 [shǒu xiān] first, before all others; first of all, in the first place - Trainchinese

1 - Why are there multiple words for first? 2 - 首先 vs 先 1. 首先 can be used as a conjunction at the beginning of a sentence: E.g. 首先，我们做个计划。First of all, let's make a plan. When 首先 is an adverb it appears after the subject before the verb: E.g. 我们首先发言。We deliver the speech first (before all others). 2. 先 when it is an adverb meaning “first, before“cannot appear at the beginning of a sentence. E.g. 我们先发言。 3. 先 has a whole bunch of other meanings that 首先 does not have. 3 - Are there any other words that have a similar meaning to 首先? (shǒu xiān) 4 - How is 首先 used in a sentence? (shǒu xiān) 5 - Is there a more formal way to say 首先? (shǒu xiān)

1 - 岂不知“第一”一词为何存在诸多同义词？
2 - “首先”与“先”之辨
1. ‘首先’可作连词，置于句首，例如：首先，我们制定一个计划。初则，吾等筹划一计。当‘首先’作为副词时，位于主语之后、动词之前：例如，我们首先发言。吾等率先发言。
2. ‘先’作为副词，意为“首先，在先”，不能置于句首。例如，我们先发言。
3. ‘先’拥有诸多‘首先’所不具备的含义。
3 - 是否存在与‘首先’（shǒu xiān）意义相近的其他词汇？（shǒu xiān）
4 - ‘首先’在句子中的用法？（shǒu xiān）
5 - 是否有比‘首先’（shǒu xiān）更为正式的表达方式？（shǒu xiān）