Breakdown of Deberías vigilar a ese espía en el hotel.
en
in / on / by (means of transport) / about (after pensar)
el hotel
the hotel
a
personal a (marks a person object)
ese
that (m.sg., also esa, esos, esas, eso)
Questions & Answers about Deberías vigilar a ese espía en el hotel.
Why do we use the conditional deberías here instead of the present tense debes?
Deberías translates to 'you should' and is used to give polite advice or a suggestion. If we used the present tense debes, it would mean 'you must', which is a much stronger obligation or a strict command.
Why is there an a before ese espía?
This is the 'personal a'. In Spanish, when the direct object of an action is a specific person, you must put an a right before it. Since a spy is a person, we say vigilar a ese espía.
The word espía ends in an 'a'. Why do we use the masculine ese instead of esa?