Which of these are prepositions in English?

• Who, what, where, when
• In, on, under, through
• However, indeed, because of
• While, since, until

ā and ab  

• must use the ablative
• sometimes use the ablative

in forum
the case being used is:

• accusative
• ablative

in forō
the case being used is:

• accusative
• ablative

 the preposition  in....

• must use only the ablative
• can use either ablative or accusative

ad insulam
the case being used is:

• accusative
• ablative

 the preposition ad

• can use either accusative or ablative
• must always use accusative

ē and ex 

• must use the accusative
• never use the accusative

ex insulā
the case being used is:

• accusative
• ablative

True or False: 
Latin prepositions can only be found in accusative or ablative cases.

• True
• False