Breakdown of Es necesario que justifiquéis el gasto.
ser
to be
que
that (relative pronoun, conjunction)
el gasto
the expense
necesario
necessary
Questions & Answers about Es necesario que justifiquéis el gasto.
Why is it spelled justifiquéis with a qu instead of a c?
The infinitive is justificar (to justify). In the present subjunctive, the vosotros ending starts with an e (-éis). If we kept the c (justificéis), it would be pronounced with a soft "th" sound in Spain. To keep the hard "k" sound of the original verb, we must change the c to qu before the letter e.
Why do we use the subjunctive mood here instead of the present indicative?
The phrase Es necesario que (It is necessary that) is an impersonal expression that states a requirement or subjective rule. This type of phrase always triggers the subjunctive mood for the verb that follows it.
Why does justifiquéis have an accent mark on the e?
For -ar verbs in the present subjunctive, the vosotros (you guys) ending is always -éis with a written accent on the e. This accent mark tells you to put the spoken stress on that vowel, preventing the stress from falling naturally on the second-to-last syllable.