can grab
Regular verb: grab - grabbed- grabbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can grab
you can grab
he can grab
we can grab
you can grab
they can grab 	I can be grabbing
you can be grabbing
he can be grabbing
we can be grabbing
you can be grabbing
they can be grabbing	I can have grabbed
you can have grabbed
he can have grabbed
we can have grabbed
you can have grabbed
they can have grabbed	I can have been grabbing
you can have been grabbing
he can have been grabbing
we can have been grabbing
you can have been grabbing
they can have been grabbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't grab
you can't grab
he can't grab
we can't grab
you can't grab
they can't grab 	I can't be grabbing
you can't be grabbing
he can't be grabbing
we can't be grabbing
you can't be grabbing
they can't be grabbing	I can't have grabbed
you can't have grabbed
he can't have grabbed
we can't have grabbed
you can't have grabbed
they can't have grabbed	I can't have been grabbing
you can't have been grabbing
he can't have been grabbing
we can't have been grabbing
you can't have been grabbing
they can't have been grabbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I grab?
can you grab?
can he grab?
can we grab?
can you grab?
can they grab? 	can I be grabbing?
can you be grabbing?
can he be grabbing?
can we be grabbing?
can you be grabbing?
can they be grabbing? 	can I have grabbed?
can you have grabbed?
can he have grabbed?
can we have grabbed?
can you have grabbed?
can they have grabbed? 	can I have been grabbing?
can you have been grabbing?
can he have been grabbing?
can we have been grabbing?
can you have been grabbing?
can they have been grabbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I grab?
can't you grab?
can't he grab?
can't we grab?
can't you grab?
can't they grab? 	can't I be grabbing?
can't you be grabbing?
can't he be grabbing?
can't we be grabbing?
can't you be grabbing?
can't they be grabbing? 	can't I have grabbed?
can't you have grabbed?
can't he have grabbed?
can't we have grabbed?
can't you have grabbed?
can't they have grabbed? 	can't I have been grabbing?
can't you have been grabbing?
can't he have been grabbing?
can't we have been grabbing?
can't you have been grabbing?
can't they have been grabbing?