The answer to this question is to look for the verb word you are trying to change. You could add (ir, er, ar) to the ending of the verb word. A lot of verb words to conjugate are easily identifiable by their endings; primarily if they are in infinitive form; where these words end in at, er, ir.
1.) Los estudiantes y yo estémos en la cafetería
. change a to e with an accent
2.) Pintán el mural. just put an accent on the a
3.) Escuché la banda. Change o to an e with an accent
4.) Nosotros abremos las cartas. change ending to emos
5.) Escribás en el papel.
change es to as with an accent on the a
6.) Examiné los cuadros en el museo.
change o to an e with an accent.
