I can couple you can couple he can couple we can couple you can couple they can couple
V-ing form
I can be coupling you can be coupling he can be coupling we can be coupling you can be coupling they can be coupling
Perfect
I can have coupled you can have coupled he can have coupled we can have coupled you can have coupled they can have coupled
V-ing perfect
I can have been coupling you can have been coupling he can have been coupling we can have been coupling you can have been coupling they can have been coupling
Negation
Simple form
I cannot couple you cannot couple he cannot couple we cannot couple you cannot couple they cannot couple
V-ing form
I cannot be coupling you cannot be coupling he cannot be coupling we cannot be coupling you cannot be coupling they cannot be coupling
Perfect
I cannot have coupled you cannot have coupled he cannot have coupled we cannot have coupled you cannot have coupled they cannot have coupled
V-ing perfect
I cannot have been coupling you cannot have been coupling he cannot have been coupling we cannot have been coupling you cannot have been coupling they cannot have been coupling
Interrogative form
Simple form
can I couple? can you couple? can he couple? can we couple? can you couple? can they couple?
V-ing form
can I be coupling? can you be coupling? can he be coupling? can we be coupling? can you be coupling? can they be coupling?
Perfect
can I have coupled? can you have coupled? can he have coupled? can we have coupled? can you have coupled? can they have coupled?
V-ing perfect
can I have been coupling? can you have been coupling? can he have been coupling? can we have been coupling? can you have been coupling? can they have been coupling?
Interro-negative form
Simple form
can I not couple? can you not couple? can he not couple? can we not couple? can you not couple? can they not couple?
V-ing form
can I not be coupling? can you not be coupling? can he not be coupling? can we not be coupling? can you not be coupling? can they not be coupling?
Perfect
can I not have coupled? can you not have coupled? can he not have coupled? can we not have coupled? can you not have coupled? can they not have coupled?
V-ing perfect
can I not have been coupling? can you not have been coupling? can he not have been coupling? can we not have been coupling? can you not have been coupling? can they not have been coupling?