Regular verb: mark mark - mark marked - mark marked
Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could mark mark you could mark mark he could mark mark we could mark mark you could mark mark they could mark mark
V-ing form
I could be mark marking you could be mark marking he could be mark marking we could be mark marking you could be mark marking they could be mark marking
Perfect
I could have mark marked you could have mark marked he could have mark marked we could have mark marked you could have mark marked they could have mark marked
V-ing perfect
I could have been mark marking you could have been mark marking he could have been mark marking we could have been mark marking you could have been mark marking they could have been mark marking
Negation
Simple form
I couldn't mark mark you couldn't mark mark he couldn't mark mark we couldn't mark mark you couldn't mark mark they couldn't mark mark
V-ing form
I couldn't be mark marking you couldn't be mark marking he couldn't be mark marking we couldn't be mark marking you couldn't be mark marking they couldn't be mark marking
Perfect
I couldn't have mark marked you couldn't have mark marked he couldn't have mark marked we couldn't have mark marked you couldn't have mark marked they couldn't have mark marked
V-ing perfect
I couldn't have been mark marking you couldn't have been mark marking he couldn't have been mark marking we couldn't have been mark marking you couldn't have been mark marking they couldn't have been mark marking
Interrogative form
Simple form
could I mark mark? could you mark mark? could he mark mark? could we mark mark? could you mark mark? could they mark mark?
V-ing form
could I be mark marking? could you be mark marking? could he be mark marking? could we be mark marking? could you be mark marking? could they be mark marking?
Perfect
could I have mark marked? could you have mark marked? could he have mark marked? could we have mark marked? could you have mark marked? could they have mark marked?
V-ing perfect
could I have been mark marking? could you have been mark marking? could he have been mark marking? could we have been mark marking? could you have been mark marking? could they have been mark marking?
Interro-negative form
Simple form
couldn't I mark mark? couldn't you mark mark? couldn't he mark mark? couldn't we mark mark? couldn't you mark mark? couldn't they mark mark?
V-ing form
couldn't I be mark marking? couldn't you be mark marking? couldn't he be mark marking? couldn't we be mark marking? couldn't you be mark marking? couldn't they be mark marking?
Perfect
couldn't I have mark marked? couldn't you have mark marked? couldn't he have mark marked? couldn't we have mark marked? couldn't you have mark marked? couldn't they have mark marked?
V-ing perfect
couldn't I have been mark marking? couldn't you have been mark marking? couldn't he have been mark marking? couldn't we have been mark marking? couldn't you have been mark marking? couldn't they have been mark marking?