Regular verb: ache - ached - ached
Simple form | V-ing form |
I must ache you must ache she must ache we must ache you must ache they must ache | I must be aching you must be aching she must be aching we must be aching you must be aching they must be aching |
Perfect | V-ing perfect |
I must have ached you must have ached she must have ached we must have ached you must have ached they must have ached | I must have been aching you must have been aching she must have been aching we must have been aching you must have been aching they must have been aching |
Simple form | V-ing form |
I mustn't ache you mustn't ache she mustn't ache we mustn't ache you mustn't ache they mustn't ache | I mustn't be aching you mustn't be aching she mustn't be aching we mustn't be aching you mustn't be aching they mustn't be aching |
Perfect | V-ing perfect |
I mustn't have ached you mustn't have ached she mustn't have ached we mustn't have ached you mustn't have ached they mustn't have ached | I mustn't have been aching you mustn't have been aching she mustn't have been aching we mustn't have been aching you mustn't have been aching they mustn't have been aching |
Simple form | V-ing form |
must I ache? must you ache? must she ache? must we ache? must you ache? must they ache? | must I be aching? must you be aching? must she be aching? must we be aching? must you be aching? must they be aching? |
Perfect | V-ing perfect |
must I have ached? must you have ached? must she have ached? must we have ached? must you have ached? must they have ached? | must I have been aching? must you have been aching? must she have been aching? must we have been aching? must you have been aching? must they have been aching? |
Simple form | V-ing form |
mustn't I ache? mustn't you ache? mustn't she ache? mustn't we ache? mustn't you ache? mustn't they ache? | mustn't I be aching? mustn't you be aching? mustn't she be aching? mustn't we be aching? mustn't you be aching? mustn't they be aching? |
Perfect | V-ing perfect |
mustn't I have ached? mustn't you have ached? mustn't she have ached? mustn't we have ached? mustn't you have ached? mustn't they have ached? | mustn't I have been aching? mustn't you have been aching? mustn't she have been aching? mustn't we have been aching? mustn't you have been aching? mustn't they have been aching? |