must cling
Irregular verb: cling - clung- clung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must cling
you must cling
he must cling
we must cling
you must cling
they must cling 	I must be clinging
you must be clinging
he must be clinging
we must be clinging
you must be clinging
they must be clinging	I must have clung
you must have clung
he must have clung
we must have clung
you must have clung
they must have clung	I must have been clinging
you must have been clinging
he must have been clinging
we must have been clinging
you must have been clinging
they must have been clinging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not cling
you must not cling
he must not cling
we must not cling
you must not cling
they must not cling 	I must not be clinging
you must not be clinging
he must not be clinging
we must not be clinging
you must not be clinging
they must not be clinging	I must not have clung
you must not have clung
he must not have clung
we must not have clung
you must not have clung
they must not have clung	I must not have been clinging
you must not have been clinging
he must not have been clinging
we must not have been clinging
you must not have been clinging
they must not have been clinging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I cling?
must you cling?
must he cling?
must we cling?
must you cling?
must they cling? 	must I be clinging?
must you be clinging?
must he be clinging?
must we be clinging?
must you be clinging?
must they be clinging? 	must I have clung?
must you have clung?
must he have clung?
must we have clung?
must you have clung?
must they have clung? 	must I have been clinging?
must you have been clinging?
must he have been clinging?
must we have been clinging?
must you have been clinging?
must they have been clinging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not cling?
must you not cling?
must he not cling?
must we not cling?
must you not cling?
must they not cling? 	must I not be clinging?
must you not be clinging?
must he not be clinging?
must we not be clinging?
must you not be clinging?
must they not be clinging? 	must I not have clung?
must you not have clung?
must he not have clung?
must we not have clung?
must you not have clung?
must they not have clung? 	must I not have been clinging?
must you not have been clinging?
must he not have been clinging?
must we not have been clinging?
must you not have been clinging?
must they not have been clinging?