So grammar knowledge: so and so can both mean "so" and "so" So is an adverb used to modify adjectives or adverbs; This is an adjective used to modify nouns. If you modify singular countable nouns (adjectives are often used before nouns), you need to add the indefinite article A or An, that is, put the indefinite article after this and before the adjective.

He writes very well. His handwriting is very good.

He told such an interesting story. He told us a very interesting story.

In addition, when there are many, many, few and few words before nouns, so is used instead of such；; When singular countable nouns are modified by adjectives, so can also be used, but the position of articles should be adjusted, that is, articles should be placed after adjectives and before singular countable nouns. For example:

They make too much noise, and our teacher is angry .. They make a lot of noise, and the teacher is angry.

The weather is getting colder every day. It is really cold today. It's really cold today.