Regular verb: use - used - used
Simple form | V-ing form |
I must use you must use she must use we must use you must use they must use | I must be using you must be using she must be using we must be using you must be using they must be using |
Perfect | V-ing perfect |
I must have used you must have used she must have used we must have used you must have used they must have used | I must have been using you must have been using she must have been using we must have been using you must have been using they must have been using |
Simple form | V-ing form |
I must not use you must not use she must not use we must not use you must not use they must not use | I must not be using you must not be using she must not be using we must not be using you must not be using they must not be using |
Perfect | V-ing perfect |
I must not have used you must not have used she must not have used we must not have used you must not have used they must not have used | I must not have been using you must not have been using she must not have been using we must not have been using you must not have been using they must not have been using |
Simple form | V-ing form |
must I use? must you use? must she use? must we use? must you use? must they use? | must I be using? must you be using? must she be using? must we be using? must you be using? must they be using? |
Perfect | V-ing perfect |
must I have used? must you have used? must she have used? must we have used? must you have used? must they have used? | must I have been using? must you have been using? must she have been using? must we have been using? must you have been using? must they have been using? |
Simple form | V-ing form |
must I not use? must you not use? must she not use? must we not use? must you not use? must they not use? | must I not be using? must you not be using? must she not be using? must we not be using? must you not be using? must they not be using? |
Perfect | V-ing perfect |
must I not have used? must you not have used? must she not have used? must we not have used? must you not have used? must they not have used? | must I not have been using? must you not have been using? must she not have been using? must we not have been using? must you not have been using? must they not have been using? |