The line "And I bet I never shall" said by Herbert White gives a hint that something bad will be going to happen in the future. The sentence is an example of foreshadowing where the event which would going to happen in the future are hinted priorly.
Explanation:
The first wish that the family wished from the Monkey's paw was to get a sum of two hundred pounds. By that money, they could repay the debts of the house. After wishing, the very next day Herbert goes out to work where he meets with a machine accident. The family receives a sum of two hundred pounds as compensatory money from the company. The line said by Herbert "And I bet I never shall" is the evidence that the money which the family would receive as a wish from the monkey's paw would never be seen by him. This was an indication that Herbert would be no longer alive to witness the sum of the money.
