I heard that
This grammar is used to convey information received from others or hearsay.
Examples
彼は入院したそうです。
I heard that he was hospitalized.
その手術は成功したそうです。
I heard that the operation was successful.
明日は病院は休みだそうです。
I heard that the hospital will be closed tomorrow.
Quick check
彼は入院した___。