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In Russian there is a verb "победить" (vincere) which doesn't have future singular 1st person form. It is impossible to say "io vincerò (in questo gioco, in questa partita)" in Russian using this verb.
Are there any verbs in Italian which do not have some grammatical form?
Some verbs, such as competere, concernere, dirimere, divergere, esimere, incombere, inerire, soccombere, splendere, suggere, and transigere don’t have a past participle. (source)
It appears that solere does not have future, conditional and imperative tenses (as they'd sound weird or nonsensical, e.g. io sorrò, lui sorrebbe).
A common category of impersonal verbs (to rain piovere, to hail grandinare) don't conjugate except for 3rd-person. This rule also applies to Italian.
Some older uses of certain verbs are also defective, e.g. ire (use andare instead), molcere (use addolcire) and calere (use importare).
You should always look up the verb in a good Italian dictionary or a verb reference like those, in order to find out missing or obsolete verb forms:
Other good online resources are verbix.com and italian-verbs.com; they are free but sometimes you'll probably find some mistakes in some verb forms.
