Question

how did Berhman ensure that the lastt leaf did not fall​

Answer 1

Explanation:

Johnsy peeps through the window to make herself sure that whether the last leaf fell or not. ... The last leaf on the ivy creeper is Behrman's Masterpiece. He painted it last night when the last leaf fell from the ivy. He died of pneumonia the next morning

Answer 2

Mr. Berhman ensured that the last leaf didn’t fall of the ivy creeper on the stormy night by Painting a realistic and natural painting on the wall of the window. When Johnsy saw the painting she thought it was real and assumed the last leaf survived.