can strain
Regular verb: strain - strained- strained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can strain
you can strain
he can strain
we can strain
you can strain
they can strain 	I can be straining
you can be straining
he can be straining
we can be straining
you can be straining
they can be straining	I can have strained
you can have strained
he can have strained
we can have strained
you can have strained
they can have strained	I can have been straining
you can have been straining
he can have been straining
we can have been straining
you can have been straining
they can have been straining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't strain
you can't strain
he can't strain
we can't strain
you can't strain
they can't strain 	I can't be straining
you can't be straining
he can't be straining
we can't be straining
you can't be straining
they can't be straining	I can't have strained
you can't have strained
he can't have strained
we can't have strained
you can't have strained
they can't have strained	I can't have been straining
you can't have been straining
he can't have been straining
we can't have been straining
you can't have been straining
they can't have been straining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I strain?
can you strain?
can he strain?
can we strain?
can you strain?
can they strain? 	can I be straining?
can you be straining?
can he be straining?
can we be straining?
can you be straining?
can they be straining? 	can I have strained?
can you have strained?
can he have strained?
can we have strained?
can you have strained?
can they have strained? 	can I have been straining?
can you have been straining?
can he have been straining?
can we have been straining?
can you have been straining?
can they have been straining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I strain?
can't you strain?
can't he strain?
can't we strain?
can't you strain?
can't they strain? 	can't I be straining?
can't you be straining?
can't he be straining?
can't we be straining?
can't you be straining?
can't they be straining? 	can't I have strained?
can't you have strained?
can't he have strained?
can't we have strained?
can't you have strained?
can't they have strained? 	can't I have been straining?
can't you have been straining?
can't he have been straining?
can't we have been straining?
can't you have been straining?
can't they have been straining?