This uses Google to find the most common completions of the entered phrases.
If you type in 'my dog' it will look for wherever people have said 'my dog is something', such as 'my dog is worried', 'my dog is cuter', etc. It then collates these results.
The Google service that this tool relies on is currently slow and often broken. If the problems continue I may add caching to speed things up.
This page is unaffiliated with Google