Looking on the internet deeply has found these results:

So grateful is the most popular phrase on the web.

Very grateful 123,500,000 results on the web	So grateful 133,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Very grateful to you for the information which set me on the right track and gave me hope. Very grateful for your hospitality, which goes far beyond what can be expected. We are very grateful to Your Grace. Three years now since diagnosis and no treatment so far. Very grateful to you for the information which set me on the right track and gave me hope. Thank you so very much... Gerdette, Ireland I am grateful For my shoes, but I would be Very grateful for a car. The local villagers were very grateful. Very grateful from now, I greet you with the blessing of Don Orione. Very grateful to Her Ladyship for the opportunity.	Things can be so difficult sometimes, and I'm so grateful. I'm so grateful, Nasserine. I was so grateful for tonight. I am so grateful for Your attitude towards me. She was always so grateful to her fans. I was so grateful that I bowed to your house. I'm so grateful Danny sent help. I am so grateful to be living in this fine country.

Very grateful

123,500,000 results on the web

So grateful

133,000,000 results on the web

More popular!

Very grateful to you for the information which set me on the right track and gave me hope.
Very grateful for your hospitality, which goes far beyond what can be expected.
We are very grateful to Your Grace.
Three years now since diagnosis and no treatment so far. Very grateful to you for the information which set me on the right track and gave me hope. Thank you so very much... Gerdette, Ireland
I am grateful For my shoes, but I would be Very grateful for a car.
The local villagers were very grateful.
Very grateful from now, I greet you with the blessing of Don Orione.
Very grateful to Her Ladyship for the opportunity.