I'm really grateful to you.
感謝しているさま
I thank you from my heart.
感謝してる
感謝しております
I am grateful.
感謝してます
I'm really grateful to you.
感謝していること
the degree to which one appreciates something
あなたにとても感謝している。
I am much obliged to you.
I thank you from my heart―thank you from the bottom of my heart―thank you cordially.
with appreciation
I thank you from my heart.
感謝して.
I am much obliged to you.