1. On the documentary Sicko,Michael Moore spoke out the truth about our healthcare system.

2. In the documentary Sicko,Michael Moore spoke out the truth about our healthcare system.

Which one would be correct? Using on or in?

In

And don't forget to put a space after the comma.

Thank you, Writeacher. I always seemed to get confused about which one to use.

YW!!

Both sentences can be correct, but they would have slightly different meanings.

1. "On the documentary Sicko, Michael Moore spoke out the truth about our healthcare system."
In this sentence, "on" is used to indicate that Michael Moore appeared on the documentary as a speaker or commentator. It suggests that he was a participant in the documentary, but not necessarily a central figure.

2. "In the documentary Sicko, Michael Moore spoke out the truth about our healthcare system."
In this sentence, "in" is used to indicate that Michael Moore was featured as a central figure in the documentary. It suggests that he played a significant role in the documentary and that he was the one who spoke out about our healthcare system.

The choice between "on" and "in" depends on the specific role Michael Moore played in the documentary. If he was a central figure, then the second sentence using "in" would be more appropriate. If he only appeared as a commentator or speaker, then the first sentence using "on" would be more appropriate.