Irish verb forms are constructed either synthetically or analytically.
Synthetic forms express the information about person and number in the ending: e.g., molaim "I praise", where the ending -aim stands for "1st person singular present". In this case, a pronoun is not allowed: * molaim mé is ungrammatical. Molann mé is allowed but using the -aim ending is more common.
Analytic forms are those whose endings contain no information about person and number, and a pronoun is necessary: e.g., molann sibh "you (pl.) praise", where the ending -ann expresses only the present tense, and the pronoun sibh "you" (pl.) must accompany it in order to express "2nd person plural".