TOO+ ADJECTIVE AND INFINITIVE.
USE TOO+ AND ADJETIVE AND AN INFITIVE TO GIVE A WARNING OR AN EXPLANATION.
IT'S TOO DARK TO GO HIKING NOW =DON'T GO HIKING NOW BECAUSE IT'S DARK.
THOSE CLIFFS ARE TOO STEEP TO CLIMB. = YOU SHOULDN'T CLIMB THOSE CLIFF BECAUSE THEY'RE VERY STEEP.
USE A FOR PHRASE TO FURTHER CLARIFY A WARNING OR EXPLANATION.
IT'S TOO DANGEROUS FOR CHILDREN TO GO SWIMMING THERE. ( ONLY ADULTS SHOULD SWIM THERE.)