"We all knew that you hadn't received a letter from her.

Put two and two together, what is the result?
Ask me something harder.

That's easy." "I make my bow to you, most observing of all observers," laughed Grace.
"I have been worried over not receiving a letter from Mabel, but I hadn't breathed it to any one.

Come into the living room before breakfast.

No; let us have breakfast first.