Here is an explanation of the uses of so and such:
So is used before an adjective or an adverb:
so big – so beautifully designed
Such is followed by a or an and is used before an adjective + a singular noun:
such a long time – such an incredible story
Such is used alone without the indefinite article a/an before plural nouns and abstract nouns such as information, advice, kindness, interest etc.
Such fools – such beautiful furniture – such generosity
This book is so interesting.
This is such an interesting book.
Such interesting books are worth having.
I was amazed that the crowd was so big.
I was amazed that there was such a big crowd.
The situation was so complicated.
It was such a complicated situation.
She is so intelligent.
She is such an intelligent person.
Lesson by Nasreen, teacher at EC Cape Town English school
Now choose the correct option for the following: