interponer

to interposeirregular-er verb

Where it breaks the pattern

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

Indicativo: interponer conjugation

	Presente	Pretérito	Imperfecto	Futuro	Condicional
yo	interpongo	interpuse	interponía	interpondré	interpondría
tú	interpones	interpusiste	interponías	interpondrás	interpondrías
él / ella / Ud.	interpone	interpuso	interponía	interpondrá	interpondría
nosotros	interponemos	interpusimos	interponíamos	interpondremos	interpondríamos
vosotros	interponéis	interpusisteis	interponíais	interpondréis	interpondríais
ellos / Uds.	interponen	interpusieron	interponían	interpondrán	interpondrían

Participio: interpuesto · Gerundio: interponiendo

irregular form

Real sentences with the conjugated form highlighted, from Tatoeba, licensed under CC BY 2.0 FR.

No dejes que nada se interponga entre tú y el éxito.
Don't let anything stand between you and success.
Esa mujer se interpuso en mi camino.
That woman blocked my way.

These verbs are poner with a prefix, and they inherit its irregular forms.