English verb conjugation
CAN TEST

Regular verb: test - tested - tested

Affirmation

Simple form	V-ing form
I can test you can test he can test we can test you can test they can test	I can be testing you can be testing he can be testing we can be testing you can be testing they can be testing
Perfect	V-ing perfect
I can have tested you can have tested he can have tested we can have tested you can have tested they can have tested	I can have been testing you can have been testing he can have been testing we can have been testing you can have been testing they can have been testing

Negation

Simple form	V-ing form
I cannot test you cannot test he cannot test we cannot test you cannot test they cannot test	I cannot be testing you cannot be testing he cannot be testing we cannot be testing you cannot be testing they cannot be testing
Perfect	V-ing perfect
I cannot have tested you cannot have tested he cannot have tested we cannot have tested you cannot have tested they cannot have tested	I cannot have been testing you cannot have been testing he cannot have been testing we cannot have been testing you cannot have been testing they cannot have been testing

Interrogative form

Simple form	V-ing form
can I test? can you test? can he test? can we test? can you test? can they test?	can I be testing? can you be testing? can he be testing? can we be testing? can you be testing? can they be testing?
Perfect	V-ing perfect
can I have tested? can you have tested? can he have tested? can we have tested? can you have tested? can they have tested?	can I have been testing? can you have been testing? can he have been testing? can we have been testing? can you have been testing? can they have been testing?

Interro-negative form

Simple form	V-ing form
can I not test? can you not test? can he not test? can we not test? can you not test? can they not test?	can I not be testing? can you not be testing? can he not be testing? can we not be testing? can you not be testing? can they not be testing?
Perfect	V-ing perfect
can I not have tested? can you not have tested? can he not have tested? can we not have tested? can you not have tested? can they not have tested?	can I not have been testing? can you not have been testing? can he not have been testing? can we not have been testing? can you not have been testing? can they not have been testing?