interponer

• interponer follows poner: irregular first-person form
• interponer follows poner: irregular preterite stem; the 1s and 3s endings are unstressed, so they carry no written accent
• interponer follows poner: irregular future stem; the endings themselves are regular
• interponer follows poner: conditional shares the irregular future stem
• interponer follows poner: present subjunctive is built from the irregular yo form
• interponer follows poner: imperfect subjunctive is built from the third-person preterite stem
• irregular past participle