I can endeavor you can endeavor he can endeavor we can endeavor you can endeavor they can endeavor
V-ing form
I can be endeavoring you can be endeavoring he can be endeavoring we can be endeavoring you can be endeavoring they can be endeavoring
Perfect
I can have endeavored you can have endeavored he can have endeavored we can have endeavored you can have endeavored they can have endeavored
V-ing perfect
I can have been endeavoring you can have been endeavoring he can have been endeavoring we can have been endeavoring you can have been endeavoring they can have been endeavoring
Negation
Simple form
I cannot endeavor you cannot endeavor he cannot endeavor we cannot endeavor you cannot endeavor they cannot endeavor
V-ing form
I cannot be endeavoring you cannot be endeavoring he cannot be endeavoring we cannot be endeavoring you cannot be endeavoring they cannot be endeavoring
Perfect
I cannot have endeavored you cannot have endeavored he cannot have endeavored we cannot have endeavored you cannot have endeavored they cannot have endeavored
V-ing perfect
I cannot have been endeavoring you cannot have been endeavoring he cannot have been endeavoring we cannot have been endeavoring you cannot have been endeavoring they cannot have been endeavoring
Interrogative form
Simple form
can I endeavor? can you endeavor? can he endeavor? can we endeavor? can you endeavor? can they endeavor?
V-ing form
can I be endeavoring? can you be endeavoring? can he be endeavoring? can we be endeavoring? can you be endeavoring? can they be endeavoring?
Perfect
can I have endeavored? can you have endeavored? can he have endeavored? can we have endeavored? can you have endeavored? can they have endeavored?
V-ing perfect
can I have been endeavoring? can you have been endeavoring? can he have been endeavoring? can we have been endeavoring? can you have been endeavoring? can they have been endeavoring?
Interro-negative form
Simple form
can I not endeavor? can you not endeavor? can he not endeavor? can we not endeavor? can you not endeavor? can they not endeavor?
V-ing form
can I not be endeavoring? can you not be endeavoring? can he not be endeavoring? can we not be endeavoring? can you not be endeavoring? can they not be endeavoring?
Perfect
can I not have endeavored? can you not have endeavored? can he not have endeavored? can we not have endeavored? can you not have endeavored? can they not have endeavored?
V-ing perfect
can I not have been endeavoring? can you not have been endeavoring? can he not have been endeavoring? can we not have been endeavoring? can you not have been endeavoring? can they not have been endeavoring?