Answer:
is missing sentence continuations but if it is to answer with the present tense it would be 
Si yo quiero
We use the present tense in spanish for:
Usual actions 
like: Todos los días leemos el periódico.
Frequently performed actions 
like: Siempre que estudia, escucha musica 
 Situations that happen when speaking 
like:Te veo un poco nervioso