Question

Is a definite article THE needed in front of ordinal numbers in sentences like these:

4th case can be used with or without prepositions. If you are doing something, it’s likely this meaning will need to be expressed in 4th case. This is a preposition that can only go with 2nd case.

Are ordinal numbers always preceded with THE or are there any exceptions?

Answer 1

Actually there are some exceptions in some cases though: a/an

example: "not only is there 3 species, but there is a 4th specimen."