may undulate
Regular verb: undulate - undulated- undulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may undulate
you may undulate
she may undulate
we may undulate
you may undulate
they may undulate 	I may be undulating
you may be undulating
she may be undulating
we may be undulating
you may be undulating
they may be undulating	I may have undulated
you may have undulated
she may have undulated
we may have undulated
you may have undulated
they may have undulated	I may have been undulating
you may have been undulating
she may have been undulating
we may have been undulating
you may have been undulating
they may have been undulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not undulate
you may not undulate
she may not undulate
we may not undulate
you may not undulate
they may not undulate 	I may not be undulating
you may not be undulating
she may not be undulating
we may not be undulating
you may not be undulating
they may not be undulating	I may not have undulated
you may not have undulated
she may not have undulated
we may not have undulated
you may not have undulated
they may not have undulated	I may not have been undulating
you may not have been undulating
she may not have been undulating
we may not have been undulating
you may not have been undulating
they may not have been undulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I undulate?
may you undulate?
may she undulate?
may we undulate?
may you undulate?
may they undulate? 	may I be undulating?
may you be undulating?
may she be undulating?
may we be undulating?
may you be undulating?
may they be undulating? 	may I have undulated?
may you have undulated?
may she have undulated?
may we have undulated?
may you have undulated?
may they have undulated? 	may I have been undulating?
may you have been undulating?
may she have been undulating?
may we have been undulating?
may you have been undulating?
may they have been undulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not undulate?
may you not undulate?
may she not undulate?
may we not undulate?
may you not undulate?
may they not undulate? 	may I not be undulating?
may you not be undulating?
may she not be undulating?
may we not be undulating?
may you not be undulating?
may they not be undulating? 	may I not have undulated?
may you not have undulated?
may she not have undulated?
may we not have undulated?
may you not have undulated?
may they not have undulated? 	may I not have been undulating?
may you not have been undulating?
may she not have been undulating?
may we not have been undulating?
may you not have been undulating?
may they not have been undulating?