can enquire
Regular verb: enquire - enquired- enquired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can enquire
you can enquire
he can enquire
we can enquire
you can enquire
they can enquire 	I can be enquiring
you can be enquiring
he can be enquiring
we can be enquiring
you can be enquiring
they can be enquiring	I can have enquired
you can have enquired
he can have enquired
we can have enquired
you can have enquired
they can have enquired	I can have been enquiring
you can have been enquiring
he can have been enquiring
we can have been enquiring
you can have been enquiring
they can have been enquiring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't enquire
you can't enquire
he can't enquire
we can't enquire
you can't enquire
they can't enquire 	I can't be enquiring
you can't be enquiring
he can't be enquiring
we can't be enquiring
you can't be enquiring
they can't be enquiring	I can't have enquired
you can't have enquired
he can't have enquired
we can't have enquired
you can't have enquired
they can't have enquired	I can't have been enquiring
you can't have been enquiring
he can't have been enquiring
we can't have been enquiring
you can't have been enquiring
they can't have been enquiring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I enquire?
can you enquire?
can he enquire?
can we enquire?
can you enquire?
can they enquire? 	can I be enquiring?
can you be enquiring?
can he be enquiring?
can we be enquiring?
can you be enquiring?
can they be enquiring? 	can I have enquired?
can you have enquired?
can he have enquired?
can we have enquired?
can you have enquired?
can they have enquired? 	can I have been enquiring?
can you have been enquiring?
can he have been enquiring?
can we have been enquiring?
can you have been enquiring?
can they have been enquiring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I enquire?
can't you enquire?
can't he enquire?
can't we enquire?
can't you enquire?
can't they enquire? 	can't I be enquiring?
can't you be enquiring?
can't he be enquiring?
can't we be enquiring?
can't you be enquiring?
can't they be enquiring? 	can't I have enquired?
can't you have enquired?
can't he have enquired?
can't we have enquired?
can't you have enquired?
can't they have enquired? 	can't I have been enquiring?
can't you have been enquiring?
can't he have been enquiring?
can't we have been enquiring?
can't you have been enquiring?
can't they have been enquiring?