Regular verb: filter - filtered - filtered
Simple form | V-ing form |
I must filter you must filter she must filter we must filter you must filter they must filter | I must be filtering you must be filtering she must be filtering we must be filtering you must be filtering they must be filtering |
Perfect | V-ing perfect |
I must have filtered you must have filtered she must have filtered we must have filtered you must have filtered they must have filtered | I must have been filtering you must have been filtering she must have been filtering we must have been filtering you must have been filtering they must have been filtering |
Simple form | V-ing form |
I must not filter you must not filter she must not filter we must not filter you must not filter they must not filter | I must not be filtering you must not be filtering she must not be filtering we must not be filtering you must not be filtering they must not be filtering |
Perfect | V-ing perfect |
I must not have filtered you must not have filtered she must not have filtered we must not have filtered you must not have filtered they must not have filtered | I must not have been filtering you must not have been filtering she must not have been filtering we must not have been filtering you must not have been filtering they must not have been filtering |
Simple form | V-ing form |
must I filter? must you filter? must she filter? must we filter? must you filter? must they filter? | must I be filtering? must you be filtering? must she be filtering? must we be filtering? must you be filtering? must they be filtering? |
Perfect | V-ing perfect |
must I have filtered? must you have filtered? must she have filtered? must we have filtered? must you have filtered? must they have filtered? | must I have been filtering? must you have been filtering? must she have been filtering? must we have been filtering? must you have been filtering? must they have been filtering? |
Simple form | V-ing form |
must I not filter? must you not filter? must she not filter? must we not filter? must you not filter? must they not filter? | must I not be filtering? must you not be filtering? must she not be filtering? must we not be filtering? must you not be filtering? must they not be filtering? |
Perfect | V-ing perfect |
must I not have filtered? must you not have filtered? must she not have filtered? must we not have filtered? must you not have filtered? must they not have filtered? | must I not have been filtering? must you not have been filtering? must she not have been filtering? must we not have been filtering? must you not have been filtering? must they not have been filtering? |