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