English verb conjugation COULD EXPLAIN

Regular verb: explain - explained - explained

Affirmation

Simple form

I could explain
you could explain
he could explain
we could explain
you could explain
they could explain

V-ing form

I could be explaining
you could be explaining
he could be explaining
we could be explaining
you could be explaining
they could be explaining

Perfect

I could have explained
you could have explained
he could have explained
we could have explained
you could have explained
they could have explained

V-ing perfect

I could have been explaining
you could have been explaining
he could have been explaining
we could have been explaining
you could have been explaining
they could have been explaining

Negation

Simple form

I couldn't explain
you couldn't explain
he couldn't explain
we couldn't explain
you couldn't explain
they couldn't explain

V-ing form

I couldn't be explaining
you couldn't be explaining
he couldn't be explaining
we couldn't be explaining
you couldn't be explaining
they couldn't be explaining

Perfect

I couldn't have explained
you couldn't have explained
he couldn't have explained
we couldn't have explained
you couldn't have explained
they couldn't have explained

V-ing perfect

I couldn't have been explaining
you couldn't have been explaining
he couldn't have been explaining
we couldn't have been explaining
you couldn't have been explaining
they couldn't have been explaining

Interrogative form

Simple form

could I explain?
could you explain?
could he explain?
could we explain?
could you explain?
could they explain?

V-ing form

could I be explaining?
could you be explaining?
could he be explaining?
could we be explaining?
could you be explaining?
could they be explaining?

Perfect

could I have explained?
could you have explained?
could he have explained?
could we have explained?
could you have explained?
could they have explained?

V-ing perfect

could I have been explaining?
could you have been explaining?
could he have been explaining?
could we have been explaining?
could you have been explaining?
could they have been explaining?

Interro-negative form

Simple form

couldn't I explain?
couldn't you explain?
couldn't he explain?
couldn't we explain?
couldn't you explain?
couldn't they explain?

V-ing form

couldn't I be explaining?
couldn't you be explaining?
couldn't he be explaining?
couldn't we be explaining?
couldn't you be explaining?
couldn't they be explaining?

Perfect

couldn't I have explained?
couldn't you have explained?
couldn't he have explained?
couldn't we have explained?
couldn't you have explained?
couldn't they have explained?

V-ing perfect

couldn't I have been explaining?
couldn't you have been explaining?
couldn't he have been explaining?
couldn't we have been explaining?
couldn't you have been explaining?
couldn't they have been explaining?

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