may preboil
Regular verb: preboil - preboiled- preboiled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may preboil
you may preboil
she may preboil
we may preboil
you may preboil
they may preboil 	I may be preboiling
you may be preboiling
she may be preboiling
we may be preboiling
you may be preboiling
they may be preboiling	I may have preboiled
you may have preboiled
she may have preboiled
we may have preboiled
you may have preboiled
they may have preboiled	I may have been preboiling
you may have been preboiling
she may have been preboiling
we may have been preboiling
you may have been preboiling
they may have been preboiling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't preboil
you mayn't preboil
she mayn't preboil
we mayn't preboil
you mayn't preboil
they mayn't preboil 	I mayn't be preboiling
you mayn't be preboiling
she mayn't be preboiling
we mayn't be preboiling
you mayn't be preboiling
they mayn't be preboiling	I mayn't have preboiled
you mayn't have preboiled
she mayn't have preboiled
we mayn't have preboiled
you mayn't have preboiled
they mayn't have preboiled	I mayn't have been preboiling
you mayn't have been preboiling
she mayn't have been preboiling
we mayn't have been preboiling
you mayn't have been preboiling
they mayn't have been preboiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I preboil?
may you preboil?
may she preboil?
may we preboil?
may you preboil?
may they preboil? 	may I be preboiling?
may you be preboiling?
may she be preboiling?
may we be preboiling?
may you be preboiling?
may they be preboiling? 	may I have preboiled?
may you have preboiled?
may she have preboiled?
may we have preboiled?
may you have preboiled?
may they have preboiled? 	may I have been preboiling?
may you have been preboiling?
may she have been preboiling?
may we have been preboiling?
may you have been preboiling?
may they have been preboiling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I preboil?
mayn't you preboil?
mayn't she preboil?
mayn't we preboil?
mayn't you preboil?
mayn't they preboil? 	mayn't I be preboiling?
mayn't you be preboiling?
mayn't she be preboiling?
mayn't we be preboiling?
mayn't you be preboiling?
mayn't they be preboiling? 	mayn't I have preboiled?
mayn't you have preboiled?
mayn't she have preboiled?
mayn't we have preboiled?
mayn't you have preboiled?
mayn't they have preboiled? 	mayn't I have been preboiling?
mayn't you have been preboiling?
mayn't she have been preboiling?
mayn't we have been preboiling?
mayn't you have been preboiling?
mayn't they have been preboiling?