| Persona | imperfect | conditional | future | subjunctive | present | preterite |
|---|---|---|---|---|---|---|
| yo | servía | serviría | serviré | sirva | sirvo | serví |
| tú | servías | servirías | servirás | sirvas | sirves | serviste |
| él / ella | servía | serviría | servirá | sirva | sirve | sirvió |
| nosotros | servíamos | serviríamos | serviremos | sirvamos | servimos | servimos |
| ustedes | servían | servirían | servirán | sirvan | sirven | sirvieron |
In Spain: vosotros form— imperfect: servíais, conditional: serviríais, future: serviréis, subjunctive: sirváis, present: servís, preterite: servisteis
The 'vosotros' form is used in Spain for informal second-person plural address. In Latin America, 'ustedes' is used in all contexts.
How can I help you, sir?
The waiter served us cold food.
This old screwdriver isn't useful for anything anymore.
My brother served in the army for five years.
I hope this explanation is useful for you to understand the problem.
This box will serve as a table until we buy one.
to be useful for something
What is this for? / What's the use of this?
to serve as, to function as
to help oneself (to food)
to be useless