Regular verb: stumble - stumbled - stumbled
Simple form | V-ing form |
I can stumble you can stumble he can stumble we can stumble you can stumble they can stumble | I can be stumbling you can be stumbling he can be stumbling we can be stumbling you can be stumbling they can be stumbling |
Perfect | V-ing perfect |
I can have stumbled you can have stumbled he can have stumbled we can have stumbled you can have stumbled they can have stumbled | I can have been stumbling you can have been stumbling he can have been stumbling we can have been stumbling you can have been stumbling they can have been stumbling |
Simple form | V-ing form |
I can't stumble you can't stumble he can't stumble we can't stumble you can't stumble they can't stumble | I can't be stumbling you can't be stumbling he can't be stumbling we can't be stumbling you can't be stumbling they can't be stumbling |
Perfect | V-ing perfect |
I can't have stumbled you can't have stumbled he can't have stumbled we can't have stumbled you can't have stumbled they can't have stumbled | I can't have been stumbling you can't have been stumbling he can't have been stumbling we can't have been stumbling you can't have been stumbling they can't have been stumbling |
Simple form | V-ing form |
can I stumble? can you stumble? can he stumble? can we stumble? can you stumble? can they stumble? | can I be stumbling? can you be stumbling? can he be stumbling? can we be stumbling? can you be stumbling? can they be stumbling? |
Perfect | V-ing perfect |
can I have stumbled? can you have stumbled? can he have stumbled? can we have stumbled? can you have stumbled? can they have stumbled? | can I have been stumbling? can you have been stumbling? can he have been stumbling? can we have been stumbling? can you have been stumbling? can they have been stumbling? |
Simple form | V-ing form |
can't I stumble? can't you stumble? can't he stumble? can't we stumble? can't you stumble? can't they stumble? | can't I be stumbling? can't you be stumbling? can't he be stumbling? can't we be stumbling? can't you be stumbling? can't they be stumbling? |
Perfect | V-ing perfect |
can't I have stumbled? can't you have stumbled? can't he have stumbled? can't we have stumbled? can't you have stumbled? can't they have stumbled? | can't I have been stumbling? can't you have been stumbling? can't he have been stumbling? can't we have been stumbling? can't you have been stumbling? can't they have been stumbling? |