こんなに / そんなに / あんなに + [i-adj] こんなに / そんなに / あんなに + [na-adj] こんなに / そんなに / あんなに + [verb (plain)] そんなに + [i-adj 〜い → 〜く] + ない どんなに + [verb て-form] + も どんなに + [i-adj 〜い → 〜くて] + も
こんなに, そんなに and あんなに mean "this much", "that much" and "that much (back then, over there)", and どんなに means "however much". They go in front of an adjective or a verb and say how far the quality or the action goes.
None of them goes straight before a noun: ×こんなに本. Before a noun the word is こんな, a separate point.
With a negative, そんなに means "not that", "not very". It plays down a degree the other person suggested, or one you might expect.
In a positive sentence, そんなに reacts to what the other person said or did, often with surprise.
どんなに pairs with a て-form and も: "however much", "no matter how". The も is not optional.
These go beyond the degree words themselves.
In writing and in heartfelt speech, どんなに with か at the end is an exclamation: "how much …!".