must tackle
Regular verb: tackle - tackled- tackled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must tackle
you must tackle
she must tackle
we must tackle
you must tackle
they must tackle 	I must be tackling
you must be tackling
she must be tackling
we must be tackling
you must be tackling
they must be tackling	I must have tackled
you must have tackled
she must have tackled
we must have tackled
you must have tackled
they must have tackled	I must have been tackling
you must have been tackling
she must have been tackling
we must have been tackling
you must have been tackling
they must have been tackling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't tackle
you mustn't tackle
she mustn't tackle
we mustn't tackle
you mustn't tackle
they mustn't tackle 	I mustn't be tackling
you mustn't be tackling
she mustn't be tackling
we mustn't be tackling
you mustn't be tackling
they mustn't be tackling	I mustn't have tackled
you mustn't have tackled
she mustn't have tackled
we mustn't have tackled
you mustn't have tackled
they mustn't have tackled	I mustn't have been tackling
you mustn't have been tackling
she mustn't have been tackling
we mustn't have been tackling
you mustn't have been tackling
they mustn't have been tackling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I tackle?
must you tackle?
must she tackle?
must we tackle?
must you tackle?
must they tackle? 	must I be tackling?
must you be tackling?
must she be tackling?
must we be tackling?
must you be tackling?
must they be tackling? 	must I have tackled?
must you have tackled?
must she have tackled?
must we have tackled?
must you have tackled?
must they have tackled? 	must I have been tackling?
must you have been tackling?
must she have been tackling?
must we have been tackling?
must you have been tackling?
must they have been tackling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I tackle?
mustn't you tackle?
mustn't she tackle?
mustn't we tackle?
mustn't you tackle?
mustn't they tackle? 	mustn't I be tackling?
mustn't you be tackling?
mustn't she be tackling?
mustn't we be tackling?
mustn't you be tackling?
mustn't they be tackling? 	mustn't I have tackled?
mustn't you have tackled?
mustn't she have tackled?
mustn't we have tackled?
mustn't you have tackled?
mustn't they have tackled? 	mustn't I have been tackling?
mustn't you have been tackling?
mustn't she have been tackling?
mustn't we have been tackling?
mustn't you have been tackling?
mustn't they have been tackling?