to understand
Irregular verb: understand - understood- understood

Indicative 	
Present 	Present continuous 	Preterite 	Preterite continuous 	
I do not understand
you do not understand
he doesnot understand
we do not understand
you do not understand
they do not understand 	Iamnot understanding
youarenot understanding
heisnot understanding
wearenot understanding
youarenot understanding
theyarenot understanding	I did not understand
you did not understand
he did not understand
we did not understand
you did not understand
they did not understand 	Iwasnot understanding
youwerenot understanding
hewasnot understanding
wewerenot understanding
youwerenot understanding
theywerenot understanding	
Present perfect 	Present perfect continuous 	Pluperfect 	Pluperfect continuous 	
I have not understood
you have not understood
hehasnot understood
we have not understood
you have not understood
they have not understood	I have not  been understanding
you have not  been understanding
hehasnot  been understanding
we have not  been understanding
you have not  been understanding
they have not  been understanding	I had not understood
you had not understood
he had not understood
we had not understood
you had not understood
they had not understood	I had not been understanding
you had not been understanding
he had not been understanding
we had not been understanding
you had not been understanding
they had not been understanding	
Future 	Future continuous 	Future perfect 	Future perfect continuous 	
I will not understand
you will not understand
he will not understand
we will not understand
you will not understand
they will not understand 	I will not be understanding
you will not be understanding
he will not be understanding
we will not be understanding
you will not be understanding
they will not be understanding	I will not have understood
you will not have understood
he will not have understood
we will not have understood
you will not have understood
they will not have understood	I will not have been understanding
you will not have been understanding
he will not have been understanding
we will not have been understanding
you will not have been understanding
they will not have been understanding	

Conditional 	
Present 	Present continuous 	Past 	Past continuous 	
I would not understand
you would not understand
he would not understand
we would not understand
you would not understand
they would not understand 	I would not be understanding
you would not be understanding
he would not be understanding
we would not be understanding
you would not be understanding
they would not be understanding	I would not have understood
you would not have understood
he would not have understood
we would not have understood
you would not have understood
they would not have understood	I would not have been understanding
you would not have been understanding
he would not have been understanding
we would not have been understanding
you would not have been understanding
they would not have been understanding	

Infinitive 	
Imperative 	
Infinitive 	 	Imperative 	 	
to understand 	 	do not understand
Let's not understand
do not understand 	 	

Participle 	
Present 	Past 	 	 	
understanding	understood