[Grammar] engage in/ be engaged in

[kadioguy]

In the LDOCE6, it says:

engage in/on/upon

1. Only 10% of American adults engage in regular exercise.
2. The two parties engaged upon an escalating political struggle.
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If I write these, do they mean the same?

1. Only 10% of American adults are engaged in regular exercise.
2. The two parties were engaged upon an escalating political struggle.

Thanks!

PS I also posted the same question on this, but all of your answers are unique to me. Hope we can discuss with each other. Thank you.

 

[kadioguy]

Forget the second 2).

Would you be so kind as to tell me more about this? Thank you.

 

[emsr2d2]

"engaged upon" is just wrong. There's not much else we can tell you.

 

[tzfujimino]

So, the example sentence in the dictionary is wrong: http://www.ldoceonline.com/dictionary/engage

(I couldn't find any citations including "engage upon" here: https://corpus.byu.edu/coca/)

Would it be correct to say The two parties engaged on an escalating political struggle?

 

[kadioguy]

(I couldn't find any citations including "engage upon" here: https://corpus.byu.edu/coca/)

In COCA there are no examples of "engage upon", but 7 examples of "engaged upon" .