A bit of grammar for my own good and the good of others.
With relatively few exceptions, the present subjunctive is formed upon the root of the Ist person, singular, present indicative. The -o of that form is replaced with the so-called "opposite vowel". For a verb of the first conjugation (-ar), the opposite vowel is e, and for verbs of the 2nd and 3rd conjugations (er/ir), the opposite vowel is a.
ar
tomar - Las decisiones que tomes . . .
er/ir
escoger - El camino que escojas . . .
sufrir - El dolor que sufras ma?ana . . .
Here to help and learn,
Norma