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Please teach me when to use so + adj + as to + verb and when to use so + adj + to verb. For example, you can say that “We’d never be so cocky as to believe the business is in the bag.” In this case you won’t say that “We’d never be so cocky to belive the business is in bag”. I am very confused! Help me!

So __As__ is a phrase.
S0 _ as to + verb _.
or can So_as believing__ is_.
Hope you can understand the above.

Thank you for your reply. I guess I wasn’t clear… I would like to know the differences between “so _ as to ” and “so _ to __”. I hope you can help me!

So__as to_,
Here “as to” can be another phrase.
as to = regarding….......(somthing).
Please check the usage of phrase:
so__to(vt.)_,
and
__as to(+believing__),
Hope this be helpful to understand the difference.

“so + adj + as to + verb” is not a very common pattern in American English conversation. When people do attempt to use it, though, they often reduce it to “so + adj + to + verb.” The structure changes, but the meaning stays the same.
For example, I’ve heard people say ”..if you’re so stupid to buy it..” when they should have said ”...if you’re so stupid as to buy it…”
In the “so + adj + to + verb” pattern, ‘so’ is similar in meaning to ‘very’ or ‘really.’ It intensifies the adjective, so you can say “I was so shocked to read that.” This pattern is much, much more common in spoken American English.
Hope this helps.