As a noun:
* The artist made a quick sketch of the cityscape.
* The detective found a sketch of the suspect in the victim's belongings.
* I made a sketch of my dream house.
As a verb:
* I'm going to sketch the sunset.
* The architect sketched out the plans for the new building.
* She sketched a portrait of her grandmother.
In a figurative sense:
* He sketched out his plan for the presentation.
* The author sketched a vivid picture of the protagonist's childhood.
In a specific context:
* The police officer asked the witness to sketch the perpetrator.
* The designer sketched a new logo for the company.
Remember to choose the correct grammatical form of "sketch" based on the context of your sentence.