For Present Tense:
* अस्ति (asti): This is the singular form of "is" and is used for one subject.
* सन्ति (santi): This is the plural form of "are" and is used for multiple subjects.
* भवन्ति (bhavanti): This is another plural form of "are," more commonly used in formal or poetic contexts.
For Past Tense:
* आसीत् (āsīt): Singular past tense of "was"
* आसन् (āsan): Plural past tense of "were"
For Future Tense:
* भवति (bhavati): Singular future tense of "will be"
* भवन्ति (bhavanti): Plural future tense of "will be"
Examples:
* रामः अस्ति (rāmaḥ asti): Rama is.
* पुस्तकानि सन्ति (pustakāni santi): The books are.
* भवन्ति (bhavanti): They are.
Important Note: The choice of verb depends on the subject's gender, number, and the tense of the sentence.
It's helpful to consult a Sanskrit grammar book or dictionary for specific conjugation rules.