may crack
Regular verb: crack - cracked- cracked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may crack
you may crack
she may crack
we may crack
you may crack
they may crack 	I may be cracking
you may be cracking
she may be cracking
we may be cracking
you may be cracking
they may be cracking	I may have cracked
you may have cracked
she may have cracked
we may have cracked
you may have cracked
they may have cracked	I may have been cracking
you may have been cracking
she may have been cracking
we may have been cracking
you may have been cracking
they may have been cracking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not crack
you may not crack
she may not crack
we may not crack
you may not crack
they may not crack 	I may not be cracking
you may not be cracking
she may not be cracking
we may not be cracking
you may not be cracking
they may not be cracking	I may not have cracked
you may not have cracked
she may not have cracked
we may not have cracked
you may not have cracked
they may not have cracked	I may not have been cracking
you may not have been cracking
she may not have been cracking
we may not have been cracking
you may not have been cracking
they may not have been cracking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I crack?
may you crack?
may she crack?
may we crack?
may you crack?
may they crack? 	may I be cracking?
may you be cracking?
may she be cracking?
may we be cracking?
may you be cracking?
may they be cracking? 	may I have cracked?
may you have cracked?
may she have cracked?
may we have cracked?
may you have cracked?
may they have cracked? 	may I have been cracking?
may you have been cracking?
may she have been cracking?
may we have been cracking?
may you have been cracking?
may they have been cracking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not crack?
may you not crack?
may she not crack?
may we not crack?
may you not crack?
may they not crack? 	may I not be cracking?
may you not be cracking?
may she not be cracking?
may we not be cracking?
may you not be cracking?
may they not be cracking? 	may I not have cracked?
may you not have cracked?
may she not have cracked?
may we not have cracked?
may you not have cracked?
may they not have cracked? 	may I not have been cracking?
may you not have been cracking?
may she not have been cracking?
may we not have been cracking?
may you not have been cracking?
may they not have been cracking?