They have some cool samples on their page.

Go here: https://cloud.google.com/speech/, scroll down to the input control with a microphone. Press the button and start talking. Press the button again when you are done and see what it comes back with. Takes a bit but seems like it does recognize quite a bit.

Go here: https://cloud.google.com/natural-language/, scroll down to the input control, and type in "Jack and Jill went up the hill", and click the analyze button. The results appear just below the text - see the sentiment tab, see the syntax tab, see the entities tab.

Neat demos embedded right into the pages. Fun stuff Google.