When using ~sou desu with adjectives, drop the final ~i (for い-adjectives) or the ~na (for な-adjectives). For the adjective いい (good), it exceptionally becomes よさそうです .
Used to describe something that appears to be in a certain state or is about to happen based on visual evidence. minna no nihongo lesson 43 renshuu b answers
You want to open the window. (開ける – akeru) When using ~sou desu with adjectives, drop the