Which sentence uses the word ending in -ing as a gerund? Convincing us all that she was angry, Liza got the last laugh.

You should take the sewing class.

Martin, knowing he'd be there soon, prepared for the difficult dicussion.

The exercise we all avoid is running.

The last one: The exercise we all avoid is running. Here the gerund is running since its a verb that ends in -ing but functions the same as a noun that why sewing is not.

Explanation:

hope this helps

i'm sorry i don't understand the question.

not exaxtly

explanation: it depends on the situation like if u do something good there will be good consequences which arent punishments but if you do somthing bad there will be bad consequences which are punishements.