So and Such

We often use 'so' and 'such' to mean 'very' or 'really'. It makes the sentence stronger and shows that there is a high level of something.
We use 'so' before an adjective or adverb (without a noun).

·         She was so beautiful (= she was very beautiful).

·         He ran so quickly (= he ran very quickly).

·         The food was so delicious (= the food was really delicious).

·         The children spoke French so well (= the children spoke French very well).

We use 'such' before a noun or an adjective + a noun. If there is 'a' or 'an', it goes after 'such'.

·         She was such a beautiful woman (= she was a very beautiful woman).

·         NOT: 'she was a so beautiful woman'.

·         NOT: 'she was a such beautiful woman'.

·         He got such a good time in the race (= he got a very good time in the race).

·         It was such delicious food (= it was really delicious food).

·         The children spoke such good French (= the children spoke really good French).

When we use 'such' directly with a noun, it's often a noun that shows our opinion.

·         He's such a genius! (= he's a real genius / he's very clever).

·         You're such a teacher! (= you act in a typical way for a teacher).

We don't use a word like 'this' or 'those' or 'your' or 'his' before 'so' and 'such'. 'So' and 'such' come directly after the verb.

·         NOT: This so beautiful city. (Instead say 'this city is so beautiful'.)

·         NOT: Your so helpful friend. (Instead say 'your friend is so helpful'.)

We can use 'so... that...' and 'such... that...' to show that there is a certain result. (We can't use 'very' or 'really' in this way.)

·         It was so cold that the pond froze (= because it was very cold, the pond froze).

·         She felt so tired that she fell asleep on the train (= because she was very tired, she fell asleep on the train).

·        It was such an expensive meal that he didn't spend any money for the rest of the month (= because it was a very expensive meal, he didn't spend any money for the rest of the month).

·       They have such a lot of books that they need to store some of them in the garage (= because they have really a lot of books, they need to store some of them in the garage).

We can drop 'that' when we use 'so' and 'such' in this way.

·        It was so cold the pond froze.

·        She felt so tired she fell asleep on the train.

·        It was such an expensive meal he didn't spend any money for the rest of the month.

·        They have such a lot of books they need to store some of them in the garage!

We can use 'so' and 'such' to mean 'to this level' or 'as ... as this'.

·        He isn't usually so late (= he isn't usually as late as this).

·        I don't often drink such a lot of coffee (= I don't often drink as much coffee as this).

We use 'so' before 'much / many / little / few' with and without a noun. This shows that the amount is really a lot or really little. 

As usual, we use a plural noun after 'many' and 'few' and an uncountable noun after 'much' and 'little'.

·         I ate so much.

·         I ate so much cake.

·         He had so many.

·         He had so many books.

·         Why did you eat so little?

·         He had so few friends that he was very lonely.

We can use 'such' before 'a lot (of)'. Again, such comes before 'a'.
(We sometimes see 'such a little + noun' but that is when 'little' is just a normal adjective: 'this is such a little flat'.)

·         He has such a lot of books.

·         I ate such a lot of cake.

Other Uses of So and Such

Here are a few more idiomatic uses of 'such' and 'so' that are slightly different from what we have already seen.
Such + noun = a certain type or kind of (this is quite formal)

·         I'd never heard such music before. (= I'd never heard this kind of music before.)

No such + noun = the noun doesn't exist

·         Ghosts? There's no such thing!

As such (formal) = in the normal meaning of the word. We usually use this in the negative ('not as such')

·         We're not going to have dinner as such, but there will be plenty of snacks. (= we're not going to have a normal dinner, but ...)

·         A: Is Lucy your boss now? 
       B: Not as such (= not exactly) but she does work for the same company.

Such as = for example / like

·         A: We should get a film for tonight. 
       B: Such as? (= please give an example of a film)

·         Cities such as London are becoming more powerful politically (= cities like London ...).

And such / and so on = and more similar things

So = a certain amount / size

·        
       It was so big (= it was the size I'm showing you with my hands).

·         There's only so much time (there's only a certain amount of time).

 So = something that has already been said

·         A: Is dinner ready?

·         B: I hope so (= I hope that dinner is ready)

Is that so? (= is that right?)

Or so = approximately

·         
      I think there were fifty people or so at the party (= I think there were approximately fifty people at the party).