być

1. to be indicates sameness or membership in a class [+nominative or instrumental]
2. to be auxilary verb used for predication [+adjective]
3. in future tense, forms future tense of imperfective verbs [+infinitive or verb in past tense]
4. in past tense, forms pluperfect tense [+verb in past tense]
5. to be indicates location, there be