Bestimmte Redewendungen verlangen den Infinitiv ohne to.

Formen
he had better ... er täte besser daran ...
he had best ... er sollte am besten ...
he had/would rather ... er möchte lieber ...
he would sooner ... er würde eher ...
he would (just) as soon ... er würde ebenso gern ...
he couldn't (help) but ... er konnte nicht anders als ...

Hierzu ein paar Beispiele:

Redewendungen mit Infinitiv ohne to
He had better go by bus; the weather is too bad to go by bike.
She had best stay at home, she is too ill to go to work.
We had/would rather go to the theatre.
They would sooner sell their house than borrow money.
She would (just) as soon read a good book as go for a walk.
He couldn't (help) but laugh.