$\text{1.}$ The girl is so intelligent that she can do this difficult exercise. 

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Cấu trúc so-that

S + tobe + so + adj/adv + that + clause 

$\text{2.}$ The shoes are too expensive for me to buy them. 

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too + adj: quá gì đó

S + tobe + too + adj +(for + O) + to - V +....

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@Shelly08

`1.` It is such an intelligent girl that she can do this difficult exercise.

`2.` The shoes aren't cheap enough for me to buy.

`@` Kiến thức :

`-`  It + Be/V + such + (a/an) + (adj) + N(s) + that + S + V +O: Quá... đến nỗi mà...

`-` S + Be/V + adj/ adv + enough + (for someone) + to do something : Đủ... cho ai đó làm gì...