I could scrape you could scrape he could scrape we could scrape you could scrape they could scrape
V-ing form
I could be scraping you could be scraping he could be scraping we could be scraping you could be scraping they could be scraping
Perfect
I could have scraped you could have scraped he could have scraped we could have scraped you could have scraped they could have scraped
V-ing perfect
I could have been scraping you could have been scraping he could have been scraping we could have been scraping you could have been scraping they could have been scraping
Negation
Simple form
I could not scrape you could not scrape he could not scrape we could not scrape you could not scrape they could not scrape
V-ing form
I could not be scraping you could not be scraping he could not be scraping we could not be scraping you could not be scraping they could not be scraping
Perfect
I could not have scraped you could not have scraped he could not have scraped we could not have scraped you could not have scraped they could not have scraped
V-ing perfect
I could not have been scraping you could not have been scraping he could not have been scraping we could not have been scraping you could not have been scraping they could not have been scraping
Interrogative form
Simple form
could I scrape? could you scrape? could he scrape? could we scrape? could you scrape? could they scrape?
V-ing form
could I be scraping? could you be scraping? could he be scraping? could we be scraping? could you be scraping? could they be scraping?
Perfect
could I have scraped? could you have scraped? could he have scraped? could we have scraped? could you have scraped? could they have scraped?
V-ing perfect
could I have been scraping? could you have been scraping? could he have been scraping? could we have been scraping? could you have been scraping? could they have been scraping?
Interro-negative form
Simple form
could I not scrape? could you not scrape? could he not scrape? could we not scrape? could you not scrape? could they not scrape?
V-ing form
could I not be scraping? could you not be scraping? could he not be scraping? could we not be scraping? could you not be scraping? could they not be scraping?
Perfect
could I not have scraped? could you not have scraped? could he not have scraped? could we not have scraped? could you not have scraped? could they not have scraped?
V-ing perfect
could I not have been scraping? could you not have been scraping? could he not have been scraping? could we not have been scraping? could you not have been scraping? could they not have been scraping?