Regular verb: ascertain - ascertained - ascertained
Simple form | V-ing form |
I could ascertain you could ascertain she could ascertain we could ascertain you could ascertain they could ascertain | I could be ascertaining you could be ascertaining she could be ascertaining we could be ascertaining you could be ascertaining they could be ascertaining |
Perfect | V-ing perfect |
I could have ascertained you could have ascertained she could have ascertained we could have ascertained you could have ascertained they could have ascertained | I could have been ascertaining you could have been ascertaining she could have been ascertaining we could have been ascertaining you could have been ascertaining they could have been ascertaining |
Simple form | V-ing form |
I couldn't ascertain you couldn't ascertain she couldn't ascertain we couldn't ascertain you couldn't ascertain they couldn't ascertain | I couldn't be ascertaining you couldn't be ascertaining she couldn't be ascertaining we couldn't be ascertaining you couldn't be ascertaining they couldn't be ascertaining |
Perfect | V-ing perfect |
I couldn't have ascertained you couldn't have ascertained she couldn't have ascertained we couldn't have ascertained you couldn't have ascertained they couldn't have ascertained | I couldn't have been ascertaining you couldn't have been ascertaining she couldn't have been ascertaining we couldn't have been ascertaining you couldn't have been ascertaining they couldn't have been ascertaining |
Simple form | V-ing form |
could I ascertain? could you ascertain? could she ascertain? could we ascertain? could you ascertain? could they ascertain? | could I be ascertaining? could you be ascertaining? could she be ascertaining? could we be ascertaining? could you be ascertaining? could they be ascertaining? |
Perfect | V-ing perfect |
could I have ascertained? could you have ascertained? could she have ascertained? could we have ascertained? could you have ascertained? could they have ascertained? | could I have been ascertaining? could you have been ascertaining? could she have been ascertaining? could we have been ascertaining? could you have been ascertaining? could they have been ascertaining? |
Simple form | V-ing form |
couldn't I ascertain? couldn't you ascertain? couldn't she ascertain? couldn't we ascertain? couldn't you ascertain? couldn't they ascertain? | couldn't I be ascertaining? couldn't you be ascertaining? couldn't she be ascertaining? couldn't we be ascertaining? couldn't you be ascertaining? couldn't they be ascertaining? |
Perfect | V-ing perfect |
couldn't I have ascertained? couldn't you have ascertained? couldn't she have ascertained? couldn't we have ascertained? couldn't you have ascertained? couldn't they have ascertained? | couldn't I have been ascertaining? couldn't you have been ascertaining? couldn't she have been ascertaining? couldn't we have been ascertaining? couldn't you have been ascertaining? couldn't they have been ascertaining? |