So

Form

• so + adjective + that
• so + adverb + that
• so + many/much + noun + that

The word that is not usually necessary to introduce the second clause.
✓ The crime rate is so high people are very frightened.

The word so has a number of other uses. Try not to get confused between them.
✓ The crime rate is so high that people are very frightened.
✓ I saw that burglar leaving the house, so I called the police.