I have two questions that have made me confused since yesterday.

a) Is it possible to use "so+adjective+to-infinitive" form instead of using "so+adjective+as+to-infinitive"? Is it possible to make the meaning remain the same?

b) I saw this explanation in the internet says "This structure(too + adjective + to- infintive) is used to explain why someone can’t do something". But in my example(the fourth sentence), the sentence isn't explain why she can't do something. The sentence explainig why she can do but the thing she do is too idiotic.

1-She is so stupid that she believed his so-called claims

2-She is so stupid as to believe his so-called claims

3-She is so stupid to believe his so-called claims

4-She is too stupid to believe his so-called claims.


1- this is grammatical and the meaning is “She was stupid; therefore she believed his false claims.” EDIT: another (maybe more accurate?) “translation” might be: “She was really stupid, which made her do stupid things like believe his false claims.” or (2nd edit) “She was very stupid, illustrated (or shown) by the fact that she believed his false claims.”

2- this one seems grammatical as well. It means “She is stupid enough that she would believe his false claims.”

3- Also grammatical. It means “She does believe his false claims, therefore she is stupid.”

4- grammatical but semantically weird. “Too smart” would make more sense. As you have it here with “too stupid” it means “She doesn’t believe his false claims because she is stupid (not smart enough).”

  • 1
    Yes, but I'm not quite convinced that therefore correctly describes the relationship between the two assertions in the first example. I can't think of any short alternative expression, but to me it's more a matter of (assertion 1) she is very stupid ... (linking element) the degree of her stupidity is illustrated by ... (assertion 2) she believed his false claims. Mar 23 '19 at 14:43
  • @Lambie I think this sentence "She is too smart to believe his false claims." is quite sarcastic. I only use when I want to make fun of her. Mar 23 '19 at 14:52
  • 1
    @TalhaÖzden My point is this: The analysis is correct, and you have to change stupid to smart to make sentence 4) make sense. With stupid, it does not make sense. With 4), it is a very typical utterance and not sarcastic at all, necessarily.
    – Lambie
    Mar 23 '19 at 15:03
  • 1
    @FumbleFingers I agree. I used “therefore” to simplify things, but probably something like “which is shown by the fact that” would be more accurate.
    – Mixolydian
    Mar 23 '19 at 15:49
  • 1
    Excellent edit. It might look like a fine point of detail, but I can imagine that for some learners it's useful information. Mar 23 '19 at 16:05

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