Regular verb: butter - buttered - buttered
Simple form | V-ing form |
I must butter you must butter he must butter we must butter you must butter they must butter | I must be buttering you must be buttering he must be buttering we must be buttering you must be buttering they must be buttering |
Perfect | V-ing perfect |
I must have buttered you must have buttered he must have buttered we must have buttered you must have buttered they must have buttered | I must have been buttering you must have been buttering he must have been buttering we must have been buttering you must have been buttering they must have been buttering |
Simple form | V-ing form |
I must not butter you must not butter he must not butter we must not butter you must not butter they must not butter | I must not be buttering you must not be buttering he must not be buttering we must not be buttering you must not be buttering they must not be buttering |
Perfect | V-ing perfect |
I must not have buttered you must not have buttered he must not have buttered we must not have buttered you must not have buttered they must not have buttered | I must not have been buttering you must not have been buttering he must not have been buttering we must not have been buttering you must not have been buttering they must not have been buttering |
Simple form | V-ing form |
must I butter? must you butter? must he butter? must we butter? must you butter? must they butter? | must I be buttering? must you be buttering? must he be buttering? must we be buttering? must you be buttering? must they be buttering? |
Perfect | V-ing perfect |
must I have buttered? must you have buttered? must he have buttered? must we have buttered? must you have buttered? must they have buttered? | must I have been buttering? must you have been buttering? must he have been buttering? must we have been buttering? must you have been buttering? must they have been buttering? |
Simple form | V-ing form |
must I not butter? must you not butter? must he not butter? must we not butter? must you not butter? must they not butter? | must I not be buttering? must you not be buttering? must he not be buttering? must we not be buttering? must you not be buttering? must they not be buttering? |
Perfect | V-ing perfect |
must I not have buttered? must you not have buttered? must he not have buttered? must we not have buttered? must you not have buttered? must they not have buttered? | must I not have been buttering? must you not have been buttering? must he not have been buttering? must we not have been buttering? must you not have been buttering? must they not have been buttering? |