What are all the subordinating conjunctions?

There isn't a single, definitive list of all subordinating conjunctions because the English language is constantly evolving. However, here are some of the most common ones, categorized by the type of relationship they express:

Time:

* After

* Before

* Since

* When

* Whenever

* While

* Until

* As

* As soon as

* Once

Cause and Effect:

* Because

* Since

* As

* So that

* In order that

Contrast:

* Although

* Though

* Even though

* While

* Whereas

* Despite

* Despite the fact that

Condition:

* If

* Unless

* Whether

* Provided that

* In case

Comparison:

* As

* Than

* Like

Place:

* Where

* Wherever

Manner:

* As

* How

Other:

* That

* Whether

Note: Some words can act as both subordinating conjunctions and prepositions depending on the context. For example, "after" can be a preposition (e.g., "He walked after her") or a subordinating conjunction (e.g., "After he left, she cried").

Remember: It's always helpful to consult a grammar guide or dictionary for a more comprehensive list and specific examples of how these conjunctions are used.