English verb conjugation
CAN PLACARD

Regular verb: placard - placarded - placarded

Affirmation

Simple form	V-ing form
I can placard you can placard he can placard we can placard you can placard they can placard	I can be placarding you can be placarding he can be placarding we can be placarding you can be placarding they can be placarding
Perfect	V-ing perfect
I can have placarded you can have placarded he can have placarded we can have placarded you can have placarded they can have placarded	I can have been placarding you can have been placarding he can have been placarding we can have been placarding you can have been placarding they can have been placarding

Negation

Simple form	V-ing form
I can't placard you can't placard he can't placard we can't placard you can't placard they can't placard	I can't be placarding you can't be placarding he can't be placarding we can't be placarding you can't be placarding they can't be placarding
Perfect	V-ing perfect
I can't have placarded you can't have placarded he can't have placarded we can't have placarded you can't have placarded they can't have placarded	I can't have been placarding you can't have been placarding he can't have been placarding we can't have been placarding you can't have been placarding they can't have been placarding

Interrogative form

Simple form	V-ing form
can I placard? can you placard? can he placard? can we placard? can you placard? can they placard?	can I be placarding? can you be placarding? can he be placarding? can we be placarding? can you be placarding? can they be placarding?
Perfect	V-ing perfect
can I have placarded? can you have placarded? can he have placarded? can we have placarded? can you have placarded? can they have placarded?	can I have been placarding? can you have been placarding? can he have been placarding? can we have been placarding? can you have been placarding? can they have been placarding?

Interro-negative form

Simple form	V-ing form
can't I placard? can't you placard? can't he placard? can't we placard? can't you placard? can't they placard?	can't I be placarding? can't you be placarding? can't he be placarding? can't we be placarding? can't you be placarding? can't they be placarding?
Perfect	V-ing perfect
can't I have placarded? can't you have placarded? can't he have placarded? can't we have placarded? can't you have placarded? can't they have placarded?	can't I have been placarding? can't you have been placarding? can't he have been placarding? can't we have been placarding? can't you have been placarding? can't they have been placarding?