Question

Which expression of thanks is most formal?Choose one

1. We are forever in your debt for helping us through this difficult time.

2. We owe you one for helping us through this tough time.

3. We are really glad you helped us through this rough patch.

Answer 1

1. "We are forever in your debt for helping us through this difficult time."

It's the most formal—wording is more solemn and traditional; 2 and 3 are informal/casual.