The past tense of sweep is swept.
This form is used to describe an action that happened in the past, for example:
- She swept the floor clean.
- The wind swept the leaves into a pile.
- He swept the dust off the table.
You can also use the past participle form, swept, to create the present perfect tense:
- I have swept the porch twice today.
- They have swept the snow off the driveway.
- She has swept the crumbs off the table.
