can precheck
Regular verb: precheck - prechecked- prechecked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can precheck
you can precheck
she can precheck
we can precheck
you can precheck
they can precheck 	I can be prechecking
you can be prechecking
she can be prechecking
we can be prechecking
you can be prechecking
they can be prechecking	I can have prechecked
you can have prechecked
she can have prechecked
we can have prechecked
you can have prechecked
they can have prechecked	I can have been prechecking
you can have been prechecking
she can have been prechecking
we can have been prechecking
you can have been prechecking
they can have been prechecking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot precheck
you cannot precheck
she cannot precheck
we cannot precheck
you cannot precheck
they cannot precheck 	I cannot be prechecking
you cannot be prechecking
she cannot be prechecking
we cannot be prechecking
you cannot be prechecking
they cannot be prechecking	I cannot have prechecked
you cannot have prechecked
she cannot have prechecked
we cannot have prechecked
you cannot have prechecked
they cannot have prechecked	I cannot have been prechecking
you cannot have been prechecking
she cannot have been prechecking
we cannot have been prechecking
you cannot have been prechecking
they cannot have been prechecking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I precheck?
can you precheck?
can she precheck?
can we precheck?
can you precheck?
can they precheck? 	can I be prechecking?
can you be prechecking?
can she be prechecking?
can we be prechecking?
can you be prechecking?
can they be prechecking? 	can I have prechecked?
can you have prechecked?
can she have prechecked?
can we have prechecked?
can you have prechecked?
can they have prechecked? 	can I have been prechecking?
can you have been prechecking?
can she have been prechecking?
can we have been prechecking?
can you have been prechecking?
can they have been prechecking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not precheck?
can you not precheck?
can she not precheck?
can we not precheck?
can you not precheck?
can they not precheck? 	can I not be prechecking?
can you not be prechecking?
can she not be prechecking?
can we not be prechecking?
can you not be prechecking?
can they not be prechecking? 	can I not have prechecked?
can you not have prechecked?
can she not have prechecked?
can we not have prechecked?
can you not have prechecked?
can they not have prechecked? 	can I not have been prechecking?
can you not have been prechecking?
can she not have been prechecking?
can we not have been prechecking?
can you not have been prechecking?
can they not have been prechecking?