Final answer:
The answer transforms informal sentences into formal register and addresses principles of grammar such as subject-verb agreement and active to passive voice transformation.
Step-by-step explanation:
The question aims to alter sentences from informal to formal register. The transformation would involve the following changes:
The termination of the sole representative agreement is not being considered for renewal due to insufficient business generation.
The machinery ought to function properly as it has undergone testing.
Our financial institution has informed us that your payment for the current month has not been received.
Additionaly, principles such as subject-verb agreement, the use of we and us in sentences, and the transformation from active to passive voice are highlighted as important grammar conventions. Also, strategies for revising sentences to make them more engaging by including a clear doer and action were discussed.