Question

he is so short that he cannot be a police officer.(too-to)**(rewrite the following)**

Answer 1

Pikachu! Your answer ^^
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He is so short that he cannot be a police officer

We have to rewrite this using too-to

your answer may go like this

He is too short to be a police officer

Here too is used in a negative sense. 
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Pikachu! ^^

Answer 2

He is too short that to become a police officer