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 can't test you can't test he can't test we can't test you can't test they can't test	I can't be testing you can't be testing he can't be testing we can't be testing you can't be testing they can't be testing
Perfect	V-ing perfect
I can't have tested you can't have tested he can't have tested we can't have tested you can't have tested they can't have tested	I can't have been testing you can't have been testing he can't have been testing we can't have been testing you can't have been testing they can't 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't I test? can't you test? can't he test? can't we test? can't you test? can't they test?	can't I be testing? can't you be testing? can't he be testing? can't we be testing? can't you be testing? can't they be testing?
Perfect	V-ing perfect
can't I have tested? can't you have tested? can't he have tested? can't we have tested? can't you have tested? can't they have tested?	can't I have been testing? can't you have been testing? can't he have been testing? can't we have been testing? can't you have been testing? can't they have been testing?