The girl is very intelligent.she can do this difficuld execise. The shoes are very expensive . I can't buy them

$\text{1.}$ 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