Irregular verb: cost - cost - cost
Simple form | V-ing form |
I must cost you must cost she must cost we must cost you must cost they must cost | I must be costing you must be costing she must be costing we must be costing you must be costing they must be costing |
Perfect | V-ing perfect |
I must have cost you must have cost she must have cost we must have cost you must have cost they must have cost | I must have been costing you must have been costing she must have been costing we must have been costing you must have been costing they must have been costing |
Simple form | V-ing form |
I mustn't cost you mustn't cost she mustn't cost we mustn't cost you mustn't cost they mustn't cost | I mustn't be costing you mustn't be costing she mustn't be costing we mustn't be costing you mustn't be costing they mustn't be costing |
Perfect | V-ing perfect |
I mustn't have cost you mustn't have cost she mustn't have cost we mustn't have cost you mustn't have cost they mustn't have cost | I mustn't have been costing you mustn't have been costing she mustn't have been costing we mustn't have been costing you mustn't have been costing they mustn't have been costing |
Simple form | V-ing form |
must I cost? must you cost? must she cost? must we cost? must you cost? must they cost? | must I be costing? must you be costing? must she be costing? must we be costing? must you be costing? must they be costing? |
Perfect | V-ing perfect |
must I have cost? must you have cost? must she have cost? must we have cost? must you have cost? must they have cost? | must I have been costing? must you have been costing? must she have been costing? must we have been costing? must you have been costing? must they have been costing? |
Simple form | V-ing form |
mustn't I cost? mustn't you cost? mustn't she cost? mustn't we cost? mustn't you cost? mustn't they cost? | mustn't I be costing? mustn't you be costing? mustn't she be costing? mustn't we be costing? mustn't you be costing? mustn't they be costing? |
Perfect | V-ing perfect |
mustn't I have cost? mustn't you have cost? mustn't she have cost? mustn't we have cost? mustn't you have cost? mustn't they have cost? | mustn't I have been costing? mustn't you have been costing? mustn't she have been costing? mustn't we have been costing? mustn't you have been costing? mustn't they have been costing? |