What bulbs are they? Maybe it's not the time of year for flowering? Are the still there? Maybe they've rotted.
We need more information.

There are so many garden bulbs Aaa. There is no easy answer. Perhaps you could give more detail. Posted at same time as Donna.....Snap.

What did you do with them last year after they'd flowered? And as the others asked, what bulbs are they, and in the ground or in pots?