Example sentence for the noun 'impact': When Robert Fairbanks was appointed General Manager of the Kwik Goo, sticky glue company, the positive impact on the employees was immediately noticed. Example sentence for the verb 'impact': The Moon has many craters caused when asteroids impact its surface.
(noun) Global warming will have an impact on the Earth's temperature. The impact of the collision crushed the rear of the car. (verb) Craters on the Moon are caused when meteoroids impact the surface. The dentist worried that the patient's wisdom tooth would impact, and require removal.
If you meant "where would you put a comma in this sentence" then i would say "The gardener took the hose and the shovel, and began to plant the flowers" There is no dash (-) in the sentence, its a comma (,) which is needed. I hope that helped.