can tweak
Regular verb: tweak - tweaked- tweaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can tweak
you can tweak
he can tweak
we can tweak
you can tweak
they can tweak 	I can be tweaking
you can be tweaking
he can be tweaking
we can be tweaking
you can be tweaking
they can be tweaking	I can have tweaked
you can have tweaked
he can have tweaked
we can have tweaked
you can have tweaked
they can have tweaked	I can have been tweaking
you can have been tweaking
he can have been tweaking
we can have been tweaking
you can have been tweaking
they can have been tweaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't tweak
you can't tweak
he can't tweak
we can't tweak
you can't tweak
they can't tweak 	I can't be tweaking
you can't be tweaking
he can't be tweaking
we can't be tweaking
you can't be tweaking
they can't be tweaking	I can't have tweaked
you can't have tweaked
he can't have tweaked
we can't have tweaked
you can't have tweaked
they can't have tweaked	I can't have been tweaking
you can't have been tweaking
he can't have been tweaking
we can't have been tweaking
you can't have been tweaking
they can't have been tweaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I tweak?
can you tweak?
can he tweak?
can we tweak?
can you tweak?
can they tweak? 	can I be tweaking?
can you be tweaking?
can he be tweaking?
can we be tweaking?
can you be tweaking?
can they be tweaking? 	can I have tweaked?
can you have tweaked?
can he have tweaked?
can we have tweaked?
can you have tweaked?
can they have tweaked? 	can I have been tweaking?
can you have been tweaking?
can he have been tweaking?
can we have been tweaking?
can you have been tweaking?
can they have been tweaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I tweak?
can't you tweak?
can't he tweak?
can't we tweak?
can't you tweak?
can't they tweak? 	can't I be tweaking?
can't you be tweaking?
can't he be tweaking?
can't we be tweaking?
can't you be tweaking?
can't they be tweaking? 	can't I have tweaked?
can't you have tweaked?
can't he have tweaked?
can't we have tweaked?
can't you have tweaked?
can't they have tweaked? 	can't I have been tweaking?
can't you have been tweaking?
can't he have been tweaking?
can't we have been tweaking?
can't you have been tweaking?
can't they have been tweaking?