The Spanish Conjunction

Si (if and whether).

Si used for "whether" may be followed by a verb in any mood and tense as in English:

No sé si habrá buena cosecha este año. 
I do not know whether there will be a good 
crop this year.
No pudo, or supo, decirme si me entregaría 
los pagarés para la fecha convenida. 
He could not tell me whether he would be 
able to hand me the promissory notes for 
the date agreed upon. 

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