Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_1977630_2 (verbs VARCHAR, yo VARCHAR)
### Question:
how many verbs have the yo form as sienta?
### Answer:
SELECT COUNT(verbs) FROM table_1977630_2 WHERE yo = "sienta"