I can lactate you can lactate he can lactate we can lactate you can lactate they can lactate
V-ing form
I can be lactating you can be lactating he can be lactating we can be lactating you can be lactating they can be lactating
Perfect
I can have lactated you can have lactated he can have lactated we can have lactated you can have lactated they can have lactated
V-ing perfect
I can have been lactating you can have been lactating he can have been lactating we can have been lactating you can have been lactating they can have been lactating
Negation
Simple form
I cannot lactate you cannot lactate he cannot lactate we cannot lactate you cannot lactate they cannot lactate
V-ing form
I cannot be lactating you cannot be lactating he cannot be lactating we cannot be lactating you cannot be lactating they cannot be lactating
Perfect
I cannot have lactated you cannot have lactated he cannot have lactated we cannot have lactated you cannot have lactated they cannot have lactated
V-ing perfect
I cannot have been lactating you cannot have been lactating he cannot have been lactating we cannot have been lactating you cannot have been lactating they cannot have been lactating
Interrogative form
Simple form
can I lactate? can you lactate? can he lactate? can we lactate? can you lactate? can they lactate?
V-ing form
can I be lactating? can you be lactating? can he be lactating? can we be lactating? can you be lactating? can they be lactating?
Perfect
can I have lactated? can you have lactated? can he have lactated? can we have lactated? can you have lactated? can they have lactated?
V-ing perfect
can I have been lactating? can you have been lactating? can he have been lactating? can we have been lactating? can you have been lactating? can they have been lactating?
Interro-negative form
Simple form
can I not lactate? can you not lactate? can he not lactate? can we not lactate? can you not lactate? can they not lactate?
V-ing form
can I not be lactating? can you not be lactating? can he not be lactating? can we not be lactating? can you not be lactating? can they not be lactating?
Perfect
can I not have lactated? can you not have lactated? can he not have lactated? can we not have lactated? can you not have lactated? can they not have lactated?
V-ing perfect
can I not have been lactating? can you not have been lactating? can he not have been lactating? can we not have been lactating? can you not have been lactating? can they not have been lactating?