I can sympathize you can sympathize he can sympathize we can sympathize you can sympathize they can sympathize
V-ing form
I can be sympathizing you can be sympathizing he can be sympathizing we can be sympathizing you can be sympathizing they can be sympathizing
Perfect
I can have sympathized you can have sympathized he can have sympathized we can have sympathized you can have sympathized they can have sympathized
V-ing perfect
I can have been sympathizing you can have been sympathizing he can have been sympathizing we can have been sympathizing you can have been sympathizing they can have been sympathizing
Negation
Simple form
I cannot sympathize you cannot sympathize he cannot sympathize we cannot sympathize you cannot sympathize they cannot sympathize
V-ing form
I cannot be sympathizing you cannot be sympathizing he cannot be sympathizing we cannot be sympathizing you cannot be sympathizing they cannot be sympathizing
Perfect
I cannot have sympathized you cannot have sympathized he cannot have sympathized we cannot have sympathized you cannot have sympathized they cannot have sympathized
V-ing perfect
I cannot have been sympathizing you cannot have been sympathizing he cannot have been sympathizing we cannot have been sympathizing you cannot have been sympathizing they cannot have been sympathizing
Interrogative form
Simple form
can I sympathize? can you sympathize? can he sympathize? can we sympathize? can you sympathize? can they sympathize?
V-ing form
can I be sympathizing? can you be sympathizing? can he be sympathizing? can we be sympathizing? can you be sympathizing? can they be sympathizing?
Perfect
can I have sympathized? can you have sympathized? can he have sympathized? can we have sympathized? can you have sympathized? can they have sympathized?
V-ing perfect
can I have been sympathizing? can you have been sympathizing? can he have been sympathizing? can we have been sympathizing? can you have been sympathizing? can they have been sympathizing?
Interro-negative form
Simple form
can I not sympathize? can you not sympathize? can he not sympathize? can we not sympathize? can you not sympathize? can they not sympathize?
V-ing form
can I not be sympathizing? can you not be sympathizing? can he not be sympathizing? can we not be sympathizing? can you not be sympathizing? can they not be sympathizing?
Perfect
can I not have sympathized? can you not have sympathized? can he not have sympathized? can we not have sympathized? can you not have sympathized? can they not have sympathized?
V-ing perfect
can I not have been sympathizing? can you not have been sympathizing? can he not have been sympathizing? can we not have been sympathizing? can you not have been sympathizing? can they not have been sympathizing?