Irregular 'IR' Verbs: Verbs Ending in 'uir'
Spanish: Cambridge International GCSE, topic 10.6.17
Verbs Ending in 'uir'
IR verbs that end in 'uir' change the spelling of their stem: 'i' for a 'y' when adding the subjunctive endings, like in the present tense. Here are a few examples:

Destruir
- Destruya - I destroy.
- Destruyas - you destroy.
- Destruya - he/she destroys / you destroy (formal).
- Destruyamos - we destroy.
- Destruyáis - you destroy (plural).
- Destruyan - they destroy / you destroy (formal plural).

Contribuir
- Contribuya - I contribute.
- Contribuyas - you contribute.
- Contribuya - he/she contributes / you contribute (formal)
- Contribuyamos - we contribute.
- Contribuyáis - you contribute (plural).
- Contribuyan - they contribute / you contribute (formal plural)
Test yourself on Irregular 'IR' Verbs: Verbs Ending in 'uir'
How do you say 'you destroy' in the present subjunctive in Spanish?
How you say 'we contribute' in the present subjunctive in Spanish?