I can give you several sentences. Don't undermine your own arguments. The river will slowly undermine this land as it rushes past. Late hours of work can undermine your health.
I have decided to clean out my garage next week. - as a verb we are having a clean out at home on the weekend. - as a noun
Example sentence - I heated the water in the kettle to make tea.
When I prepare to write a speech, the idea summary will be found in the topic sentence.
Did you manage to finish your speech? or, We need you to manage this company.