Spanish grammar: subjuntivo en oraciones subordinadas adjetivas

What this grammar point covers

The subjunctive in Spanish adjective (relative) clauses is used when describing something that is unknown, uncertain, or desired. These are clauses that describe a noun, usually introduced by 'que'.

When to use it

Use the subjunctive in adjective clauses when talking about something that may not exist, is hypothetical, or is not specific. For example, when you want, look for, or need something but are not sure if it exists.

Key forms

• Noun + que + verb in subjunctive
• Busco un libro que sea interesante.
• No hay nadie que pueda ayudarte.

Examples

Tips

• Use the subjunctive when the existence of the noun is not certain.
• If you are talking about something specific or real, use the indicative instead.
• Watch out for common verbs like 'buscar', 'querer', and 'necesitar' when they refer to something unknown.

Exceptions and edge cases

• If the noun is known, definite, or exists, use the indicative, not the subjunctive.