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 couldn't scrape you couldn't scrape he couldn't scrape we couldn't scrape you couldn't scrape they couldn't scrape
V-ing form
I couldn't be scraping you couldn't be scraping he couldn't be scraping we couldn't be scraping you couldn't be scraping they couldn't be scraping
Perfect
I couldn't have scraped you couldn't have scraped he couldn't have scraped we couldn't have scraped you couldn't have scraped they couldn't have scraped
V-ing perfect
I couldn't have been scraping you couldn't have been scraping he couldn't have been scraping we couldn't have been scraping you couldn't have been scraping they couldn't 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
couldn't I scrape? couldn't you scrape? couldn't he scrape? couldn't we scrape? couldn't you scrape? couldn't they scrape?
V-ing form
couldn't I be scraping? couldn't you be scraping? couldn't he be scraping? couldn't we be scraping? couldn't you be scraping? couldn't they be scraping?
Perfect
couldn't I have scraped? couldn't you have scraped? couldn't he have scraped? couldn't we have scraped? couldn't you have scraped? couldn't they have scraped?
V-ing perfect
couldn't I have been scraping? couldn't you have been scraping? couldn't he have been scraping? couldn't we have been scraping? couldn't you have been scraping? couldn't they have been scraping?