Looking on the internet deeply has found these results:

I don't know what to do is the most popular phrase on the web.

what to do i don't know 121,300 results on the web	I don't know what to do 1122,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Now I don't know what to do, I don't know what to do when she makes me sad. She is everything to me. The unrequited dream. A song that no one sings (I can probably say) I don't know what to do! I don't know what to do! I don't know what to do! (I can probably say) I don't know what to do! I don't know what to do! Now I don't know what to do, I don't know what to do. When she makes me sad. She is everything to me. The unrequited dream. A song that no one sings (I can probably say) I don't know what to do! I don't know what to do! I don't know what to do! (I can probably say) I don't know what to do! I don't know what to do!	ryong, I don't know what to do. I don't know what to do about Luke. Frankly, I don't know what to do. I don't know what to do, Lizzie. Ladies, I don't know what to do. Godfather, I don't know what to do. I don't know what to do, Arthur. Sung

what to do i don't know

121,300 results on the web

I don't know what to do

1122,000,000 results on the web

More popular!

Now I don't know what to do, I don't know what to do when she makes me sad. She is everything to me. The unrequited dream. A song that no one sings
(I can probably say) I don't know what to do! I don't know what to do! I don't know what to do! (I can probably say) I don't know what to do! I don't know what to do!
Now I don't know what to do, I don't know what to do. When she makes me sad. She is everything to me. The unrequited dream. A song that no one sings
(I can probably say) I don't know what to do! I don't know what to do! I don't know what to do! (I can probably say) I don't know what to do! I don't know what to do!