"engaged in class" is correct and can be used in written English.
It means actively participating and paying attention in a class or lesson. Example: The students were engaged in class, eagerly raising their hands and asking questions about the lesson.
Mr. Herbert wants us to believe that Al Gore is not engaged in class warfare.
Last time, he said, he gave money to Barack Obama, but he believes that the President has engaged in class warfare.
The university is also trying a new "first-year experience" program that teaches study skills and time management and offers field trips, dances and other events designed to make commuter students feel part of a community, and thus more engaged in class.
In it, Warren forcefully disputes the Republican charge that the President, by calling for taxes on the very wealthy, has engaged in "class warfare": "This is the argument that Democrats have been demanding that the President make for years," Lizza says.
"Students are less and less engaged in class, hence they learn less," says De Rossi.
Socialist parties initially understood themselves as class parties engaged in class struggle, drawing upon class solidarity to defeat their class enemies.
Mr. Obama sought to pre-empt a Republican response that he was engaging in class warfare.
"Yet his desire to engage in class warfare for political gain has left us more divided than ever".
Mr. Sanders, who has a habit of answering questions with questions, says it is Republicans who are engaging in class warfare.
Follow news of the presidential campaign on a digital or timeline, Facebook page or Twitter feed over time, and engage in class discussion along the way.
