= (intended) His food is so delicious that his friends can't forget the taste of it.
I know the "as to" phrase used here is an infinitive which expresses "how delicious the food is".
And as it is an infinitive, I thought I can use "for his friends" to mention the sense subject of the infinitive.
Also, I used "not" to express "negative meaning".
My question is whether the sentence I made makes sense or not to you English people.
I hope a good explanation. And thank you in advance! Have a nice day.
Your first sentence does not use a known grammatical structure. There are two constructions here:
a) so [adj/adv] that + clause (consequence). Your second sentence is a perfect example.
b) so as to-infinitive (purpose) - I think you were thinking of this.
e.g. I need to study English so as to work abroad next year.
We can only use "so as to-infinitive" when the subject does not change.
This construction is used in more formal/academic contexts than my example. You can survive your whole life without using it.
It is more common to introduce a purpose with just "to-infinitive" or "in order to-infinitive"
e.g. I need to study English (in order) to work abroad next year.
Here are some real sentences with "so as to"
Your so/as sentence is not a good sentence in English. Your second sentence conveys the meaning much better.
I'm not an English teacher, but I am wracking my brain trying to find examples of the proper use of so/as. Everything I think of sounds awkward or archaic. I am not convinced studying so/as will prove to be of much use.
