1. Due to his bad behavior, his mother was sad. (because) (cause) 2. The terrible tornado caused the severe damage to the village. (due to) (result from)

1. Because he had a bad behavior, his mother was sad.

His mother was sad cause of his bad behavior. 

2. Due to the terrible tornado, the village is damaged severe.

Result from the terrible tornado is the severe damage of the village.

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1.His mother was sad because he had behavior.

His mother was sad cause of his bad behavior.

2.Due to the terrible tornado, the village is damaged severe.

Result from the terrible tornado is the severe damage of the village.