Coordination of two elements

Both/and, as well as, partly/partly, neither/nor and neither/nor are fixed expressions. If you want to express yourself with any of them, you must use both parts. Both-and (1) and as-well-as (2) are used when coordinating two clauses (although each clause can contain several parts). Parts-part (3) can coordinate several clauses where the last part can be preceded by and. If the clause is negated, you do not write but use neither-or (4) or neither-or (5a, 5b).

Example:
(1) He bought both apples and pears.
(2) He bought both apples and pears.
(3) He bought some apples, some pears and some bananas.
(4) He bought neither apples nor pears.
(5a) He bought neither apples nor pears.
(5b) He did not buy any apples, pears or bananas.

Both

If you place both first, the preposition for must be repeated.

Example:
This guide is written for both men and women.
The instructions are written for both men and women.

Before and before

Before and before are not interchangeable in all contexts, but in many. Something that was long debated in the language world, but is now fully accepted, is the use of before as a preposition.
In the following example, both options are now considered correct:
We work a lot before the holidays.
We work a lot before the holidays.

One area of use where the two are not interchangeable is the introduction of subordinate clauses. It is only before that should be used as a subjunctive. An example of a correct formulation is:
We will be able to do everything we need to do before the summer arrives.
In this context, it is not considered correct to replace before with before. Thus, we will be able to do everything we need to do before the summer arrives is not considered correct. In the fixed expression before then, you cannot replace before with before.

To summarise, both before and before can be used in prepositional phrases, such as before dinner, before evening or before dinner, before evening. On the other hand, only before is suitable for introducing a subordinate clause.