English verb conjugation
CAN COMPARE

Regular verb: compare - compared - compared

Affirmation

Simple form	V-ing form
I can compare you can compare he can compare we can compare you can compare they can compare	I can be comparing you can be comparing he can be comparing we can be comparing you can be comparing they can be comparing
Perfect	V-ing perfect
I can have compared you can have compared he can have compared we can have compared you can have compared they can have compared	I can have been comparing you can have been comparing he can have been comparing we can have been comparing you can have been comparing they can have been comparing

Negation

Simple form	V-ing form
I cannot compare you cannot compare he cannot compare we cannot compare you cannot compare they cannot compare	I cannot be comparing you cannot be comparing he cannot be comparing we cannot be comparing you cannot be comparing they cannot be comparing
Perfect	V-ing perfect
I cannot have compared you cannot have compared he cannot have compared we cannot have compared you cannot have compared they cannot have compared	I cannot have been comparing you cannot have been comparing he cannot have been comparing we cannot have been comparing you cannot have been comparing they cannot have been comparing

Interrogative form

Simple form	V-ing form
can I compare? can you compare? can he compare? can we compare? can you compare? can they compare?	can I be comparing? can you be comparing? can he be comparing? can we be comparing? can you be comparing? can they be comparing?
Perfect	V-ing perfect
can I have compared? can you have compared? can he have compared? can we have compared? can you have compared? can they have compared?	can I have been comparing? can you have been comparing? can he have been comparing? can we have been comparing? can you have been comparing? can they have been comparing?

Interro-negative form

Simple form	V-ing form
can I not compare? can you not compare? can he not compare? can we not compare? can you not compare? can they not compare?	can I not be comparing? can you not be comparing? can he not be comparing? can we not be comparing? can you not be comparing? can they not be comparing?
Perfect	V-ing perfect
can I not have compared? can you not have compared? can he not have compared? can we not have compared? can you not have compared? can they not have compared?	can I not have been comparing? can you not have been comparing? can he not have been comparing? can we not have been comparing? can you not have been comparing? can they not have been comparing?