He is so weak that he can't lift this suitcase
He such a weak boy that he can't lift this suitcase
He isn't strong enough to lift this suitcase
-He is so weak to lift this suitcase
-He such weak to lift this suitcase?
-He isn't strong enough to lift this suitcase
+ He is so weak that he can't lift this suitcase.
+ He such a weak boy that he can't lift this suitcase.
+ He isn't strong enough to lift this suitcase.