-ar/-er stem changing in present subjunctive

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-ar/-er stem changing in present subjunctive
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-ar/-er Stem changing in present subjunctive

• Stem changing in the present subjunctive is not
  any harder than conjugating in the present tense.
  
• The rules are the same as regular present tense
  conjugation.
• If the infinitive stem changes in the present
  tense, it will in present subjunctive.
• Nosotros and Vosotros still dont make stem
  changes
• -ir stem changers have a different set of rules!

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-ar / -er stem changers

• Example
• querer
• quiera / quieras / quiera / queramos / queráis /
  quieran
• acostarse
• me acueste / te acuestes / se acueste / nos
  acostemos / os acostéis / se acuesten