Regular verb: trek - trekked - trekked
Simple form | V-ing form |
I must trek you must trek he must trek we must trek you must trek they must trek | I must be trekking you must be trekking he must be trekking we must be trekking you must be trekking they must be trekking |
Perfect | V-ing perfect |
I must have trekked you must have trekked he must have trekked we must have trekked you must have trekked they must have trekked | I must have been trekking you must have been trekking he must have been trekking we must have been trekking you must have been trekking they must have been trekking |
Simple form | V-ing form |
I mustn't trek you mustn't trek he mustn't trek we mustn't trek you mustn't trek they mustn't trek | I mustn't be trekking you mustn't be trekking he mustn't be trekking we mustn't be trekking you mustn't be trekking they mustn't be trekking |
Perfect | V-ing perfect |
I mustn't have trekked you mustn't have trekked he mustn't have trekked we mustn't have trekked you mustn't have trekked they mustn't have trekked | I mustn't have been trekking you mustn't have been trekking he mustn't have been trekking we mustn't have been trekking you mustn't have been trekking they mustn't have been trekking |
Simple form | V-ing form |
must I trek? must you trek? must he trek? must we trek? must you trek? must they trek? | must I be trekking? must you be trekking? must he be trekking? must we be trekking? must you be trekking? must they be trekking? |
Perfect | V-ing perfect |
must I have trekked? must you have trekked? must he have trekked? must we have trekked? must you have trekked? must they have trekked? | must I have been trekking? must you have been trekking? must he have been trekking? must we have been trekking? must you have been trekking? must they have been trekking? |
Simple form | V-ing form |
mustn't I trek? mustn't you trek? mustn't he trek? mustn't we trek? mustn't you trek? mustn't they trek? | mustn't I be trekking? mustn't you be trekking? mustn't he be trekking? mustn't we be trekking? mustn't you be trekking? mustn't they be trekking? |
Perfect | V-ing perfect |
mustn't I have trekked? mustn't you have trekked? mustn't he have trekked? mustn't we have trekked? mustn't you have trekked? mustn't they have trekked? | mustn't I have been trekking? mustn't you have been trekking? mustn't he have been trekking? mustn't we have been trekking? mustn't you have been trekking? mustn't they have been trekking? |