Conjugation of verb "To cost"
Present Simple Continuous
Negative
He/She/It is not costing.
Negative
He/She/It was not costing.
Present Perfect Continuous
Affirmative
He/She/It has been costing.
Negative
You have not been costing.
We have not been costing.
He/She/It has not been costing.
You have not been costing.
They have not been costing.
Interrogative
Has he/she/it been costing?
Affirmative
He/She/It had been costing.
Negative
You had not been costing.
He/She/It had not been costing.
You had not been costing.
They had not been costing.
Interrogative
Had he/she/it been costing?
Affirmative
He/She/It will have cost.
Negative
He/She/It will not have cost.
Interrogative
Will he/she/it have cost?
Negative
He/She/It would not cost.
Affirmative
He/She/It would have cost.
Negative
He/She/It would not have cost.
They would not have cost.
Interrogative
Would he/she/it have cost?