A number of prepositions can be used following "available" --
AT - The book is available at the store
ON - The file is available on the internet.
IN - Food is available in the cafeteria.
FOR - A bilingual library will soon be available for foreign students.
TO - The exhibit will be available to the public.
BY - A new model will be available by September.
No, the word "when" is not a preposition. It is an adverb or a conjunction used to indicate time or a condition.
The word " I " is not a preposition, it is a pronoun.
Yes. Because can be used as a preposition.
No. It is a coordinating conjunction. It can rarely be a noun. It cannot be used as a preposition.
No, the word "early" is an adverb, not a preposition. It is used to describe the timing of an action or event.
No, the word "when" is not a preposition. It is an adverb or a conjunction used to indicate time or a condition.
The word " I " is not a preposition, it is a pronoun.
Yes. Because can be used as a preposition.
No. It is a coordinating conjunction. It can rarely be a noun. It cannot be used as a preposition.
No, the word "early" is an adverb, not a preposition. It is used to describe the timing of an action or event.
The word "a" is never used as a preposition. It may be used as part of a prepositional phrase. However, the word "at" is a preposition, indicating location or time.
It is almost always used as a preposition.
The preposition "in" is used with the word "supply" in most cases. For example, "in supply," "in short supply." It indicates the location or status of something available.
Yes, you can use the word but as a preposition. It is a preposition the same as about, by, for, and than.
No, it is not a preposition. Why can be an adverb, conjunction, interjection, and possibly a noun, but not a preposition.
No, the word "forget" is not a preposition. It is a verb used to describe the action of not remembering something.
Cannot be used as a preposition, but can be used as a verb or interjection