Adverbial clauses of result denote the result of the action expressed in the principal clause. Very often adverbial clauses of this type have an additional meaning of degree.
Adverbial clauses of pure result are introduced by the conjunction so that; they are usually separated from the principal clause by a comma.
Darkness had fallen and a keen blizzard was blowing, so that the streets were
nearly deserted.(Conan Doyle)
Adverbial clauses of result with an additional meaning of degree are introduced by the conjunction that; in these cases we find the adverb so or the demonstrative pronoun such in the principal clause. Such clauses are not separated from the principal clause by a comma.
He is so weak physically that he can hardly move.(Shaw)
Tom was in ecstasies — in such ecstasies that he even controlled his tongue
and was silent.(Twain)
Adverbial clauses of manner.
Adverbial clauses of manner characterize in a general way the action expressed in the principal clause. They are usually introduced by the conjunction as. In adverbial clauses of manner the idea of comparison is often implied.
...she did exactly as he told her.(Hardy)
Joe left the house as he had entered it...(Cronin)