could tender
Regular verb: tender - tendered- tendered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tender
you could tender
he could tender
we could tender
you could tender
they could tender 	I could be tendering
you could be tendering
he could be tendering
we could be tendering
you could be tendering
they could be tendering	I could have tendered
you could have tendered
he could have tendered
we could have tendered
you could have tendered
they could have tendered	I could have been tendering
you could have been tendering
he could have been tendering
we could have been tendering
you could have been tendering
they could have been tendering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tender
you couldn't tender
he couldn't tender
we couldn't tender
you couldn't tender
they couldn't tender 	I couldn't be tendering
you couldn't be tendering
he couldn't be tendering
we couldn't be tendering
you couldn't be tendering
they couldn't be tendering	I couldn't have tendered
you couldn't have tendered
he couldn't have tendered
we couldn't have tendered
you couldn't have tendered
they couldn't have tendered	I couldn't have been tendering
you couldn't have been tendering
he couldn't have been tendering
we couldn't have been tendering
you couldn't have been tendering
they couldn't have been tendering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tender?
could you tender?
could he tender?
could we tender?
could you tender?
could they tender? 	could I be tendering?
could you be tendering?
could he be tendering?
could we be tendering?
could you be tendering?
could they be tendering? 	could I have tendered?
could you have tendered?
could he have tendered?
could we have tendered?
could you have tendered?
could they have tendered? 	could I have been tendering?
could you have been tendering?
could he have been tendering?
could we have been tendering?
could you have been tendering?
could they have been tendering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tender?
couldn't you tender?
couldn't he tender?
couldn't we tender?
couldn't you tender?
couldn't they tender? 	couldn't I be tendering?
couldn't you be tendering?
couldn't he be tendering?
couldn't we be tendering?
couldn't you be tendering?
couldn't they be tendering? 	couldn't I have tendered?
couldn't you have tendered?
couldn't he have tendered?
couldn't we have tendered?
couldn't you have tendered?
couldn't they have tendered? 	couldn't I have been tendering?
couldn't you have been tendering?
couldn't he have been tendering?
couldn't we have been tendering?
couldn't you have been tendering?
couldn't they have been tendering?