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