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