contraer

to contractirregular-er verb

Where it breaks the pattern

contraer follows traer: irregular first-person form
contraer follows traer: irregular preterite stem; the 1s and 3s endings are unstressed, so they carry no written accent
contraer follows traer: present subjunctive is built from the irregular yo form
contraer follows traer: imperfect subjunctive is built from the third-person preterite stem
unstressed i → y between vowels

Indicativo: contraer conjugation

	Presente	Pretérito	Imperfecto	Futuro	Condicional
yo	contraigo	contraje	contraía	contraeré	contraería
tú	contraes	contrajiste	contraías	contraerás	contraerías
él / ella / Ud.	contrae	contrajo	contraía	contraerá	contraería
nosotros	contraemos	contrajimos	contraíamos	contraeremos	contraeríamos
vosotros	contraéis	contrajisteis	contraíais	contraeréis	contraeríais
ellos / Uds.	contraen	contrajeron	contraían	contraerán	contraerían

Participio: contraido · Gerundio: contrayendo

irregular form

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

Mi padre contrajo una neumonía el mes pasado.
My father contracted pneumonia last month.
Mucha gente contrae matrimonio en sábado.
Lots of people get married on Saturdays.
Él se contrajo una enfermedad incurable.
He contracted an incurable disease.

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