can preinvestigate
Regular verb: preinvestigate - preinvestigated- preinvestigated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can preinvestigate
you can preinvestigate
he can preinvestigate
we can preinvestigate
you can preinvestigate
they can preinvestigate 	I can be preinvestigating
you can be preinvestigating
he can be preinvestigating
we can be preinvestigating
you can be preinvestigating
they can be preinvestigating	I can have preinvestigated
you can have preinvestigated
he can have preinvestigated
we can have preinvestigated
you can have preinvestigated
they can have preinvestigated	I can have been preinvestigating
you can have been preinvestigating
he can have been preinvestigating
we can have been preinvestigating
you can have been preinvestigating
they can have been preinvestigating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't preinvestigate
you can't preinvestigate
he can't preinvestigate
we can't preinvestigate
you can't preinvestigate
they can't preinvestigate 	I can't be preinvestigating
you can't be preinvestigating
he can't be preinvestigating
we can't be preinvestigating
you can't be preinvestigating
they can't be preinvestigating	I can't have preinvestigated
you can't have preinvestigated
he can't have preinvestigated
we can't have preinvestigated
you can't have preinvestigated
they can't have preinvestigated	I can't have been preinvestigating
you can't have been preinvestigating
he can't have been preinvestigating
we can't have been preinvestigating
you can't have been preinvestigating
they can't have been preinvestigating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I preinvestigate?
can you preinvestigate?
can he preinvestigate?
can we preinvestigate?
can you preinvestigate?
can they preinvestigate? 	can I be preinvestigating?
can you be preinvestigating?
can he be preinvestigating?
can we be preinvestigating?
can you be preinvestigating?
can they be preinvestigating? 	can I have preinvestigated?
can you have preinvestigated?
can he have preinvestigated?
can we have preinvestigated?
can you have preinvestigated?
can they have preinvestigated? 	can I have been preinvestigating?
can you have been preinvestigating?
can he have been preinvestigating?
can we have been preinvestigating?
can you have been preinvestigating?
can they have been preinvestigating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I preinvestigate?
can't you preinvestigate?
can't he preinvestigate?
can't we preinvestigate?
can't you preinvestigate?
can't they preinvestigate? 	can't I be preinvestigating?
can't you be preinvestigating?
can't he be preinvestigating?
can't we be preinvestigating?
can't you be preinvestigating?
can't they be preinvestigating? 	can't I have preinvestigated?
can't you have preinvestigated?
can't he have preinvestigated?
can't we have preinvestigated?
can't you have preinvestigated?
can't they have preinvestigated? 	can't I have been preinvestigating?
can't you have been preinvestigating?
can't he have been preinvestigating?
can't we have been preinvestigating?
can't you have been preinvestigating?
can't they have been preinvestigating?