4.

1. Mary is as intelligent as her brother

2. A lemon is not as sweet as an orange

3. a donkey is not as big as a horse

4. This dress is as expensive as that one

5. The weather is not as cold as yesterday

5.

1. play the piano

2. write a to-do list

3. draw a painting

4. take a photo

6. 

1. neither

2. so

3. was too

4. so do

5. do too

6. so will

7. don't either

8. neither do

9. won't either

10. isn't either

4/

1. Mary is as intelligent as his brother. 

2. A lemon is not as sweet as an orange.

3. A donkey is not as big as a horse.

4. This dress is as expensive as that one.

5. The weather is not as cold as it was yesterday.

5/

1. play the piano

2. write some notes

3. draw a picture

6/

1. neither

2. so

3. was, too

4. so did

5. do, too

6. so will

7. don't, either

8. so are

9. won't, either

10. doesn't, either

7/

1. I do, too.

So do I.

2. My sister does, too. 

So does my sister.