1)當let後只有一個單音節動詞,變被動語態時,可用不帶to 的不定式。 They let the strange go.---> The strange was let go.
2) 若let 後賓補較長時,let 通常不用被動語態,而用allow或permit 代替。 The nurse let me go to see my classmate in the hospital. ----> I was allowed / permitted to see my classmate in the hospital.