ADVERB
Forse [ avverbio] [adverb]
1.Without certainty, no absolute assurance, it usually indicates a doubt, uncertainty about what was said;
we can translate in english as the adverb ----> Perhaps!
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MODAL VERB
Puo' darsi : is the verb "Potere " used as a modal verb
example :
può essere, può darsi, potrei sbagliarmi ,
it indicates that there are more or less 50% certainy THIS IS SIMILAR TO THE ENGLISH MODAL VERB "MAYBE" or "COULD BE"
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FUTURE
Sarà !!! It's the the third person singolar of the future of the verb to be "essere"
like "It will be....." It express doubt and uncertainty , we don't know the future but we will see what happens