Spanish conjugating verbs?

It really depends what you want to say. Sometimes you conjugate just one and sometimes both (for example, when using the subjunctive). And you cannot conjugate casamiento as it is a noun, you would use the verb to marry, casar. And it would be case with an accent on the e for I married and caso with an accent on the o for he/she/usted married if that's what you meant by singular.