1. Tigers are smaller than elephants. (not as...as)

=> Tigers are not as bigger as elephants.

2. The seal is 1 meter long. The dolphin is 1 meter long. (as...as)

=> The seal is as long as the dolphin.

3. James is 70kg. Nick is 90kg. (not as...as)

=> James isn't as heavy as Nick.

4. This car is the same as the car in our garage. (not different from)

=> This car is not different from the car in the garage.

5. This picture is not different from the picture we have at home. (the same as)

=> This picture is the same as the picture we have at home.