Wah How to use So and Such.

We use So and Such to show the extreme of something.
These forms are often used in interjections.

So + adjective 

• This box is so heavy!
• This meal is so terrible!
• That movie is so boring!
• You are so clever!
• They are so lovely!
• Sara's eyes are so beautiful!

Such + adjective + noun.

• This is such a heavy box!
• This is such a terrible meal!
• That is such a boring movie!
• You are such a clever person!
• They are such lovely people!
• Sara has such beautiful eyes!

You can use So + much / many to indicate the quantity of a noun.

• Martin makes so much money.
• I don't have so much time to do that.
• She has so many friends.
• I never knew John had so many sisters.
• He had so many problems.

And you can also use Such + a lot of to indicate the quantity of a noun.

• Martin makes such a lot of money.
• I don't have such a lot of  time to do that.
• She has such a lot of friends.
• I never knew John had such a lot of sisters.
• He had such a lot of problems.

That is such a beautiful castle!