Es necesario que vayas a la embajada hoy.

Breakdown of Es necesario que vayas a la embajada hoy.

ser
to be
ir
to go
hoy
today
a
to
que
that / than
necesario
necessary
la embajada
the embassy

Questions & Answers about Es necesario que vayas a la embajada hoy.

Why is the verb vayas used here instead of vas?
The phrase Es necesario que (It is necessary that) expresses a requirement, which triggers the subjunctive mood for the action that follows. Vayas is the subjunctive form of ir (to go). If you used the normal present tense vas, it would just be a statement of fact: you are going.
Where does the 'y' come from in vayas?
The verb ir (to go) is completely irregular in the present subjunctive. Instead of following the normal rules, its base changes to vay-. Since it is an -ir verb, it takes the opposite -ar endings. For the (you) form, you add -as to get vayas.
Why do we use a la embajada instead of en la embajada?
In Spanish, the verb ir (to go) always expresses movement toward a destination, so it is followed by the preposition a (to). You only use en (in/at) when talking about a static location, like estoy en la embajada (I am at the embassy).
Is it okay to include the pronoun and say que tú vayas?
Yes, adding is grammatically correct. However, because the -s ending on vayas already tells us exactly who is going, native speakers usually drop the to sound more natural.

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