Regular verb: stumble - stumbled - stumbled
Simple form | V-ing form |
I can stumble you can stumble she can stumble we can stumble you can stumble they can stumble | I can be stumbling you can be stumbling she 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 she 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 she 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 cannot stumble you cannot stumble she cannot stumble we cannot stumble you cannot stumble they cannot stumble | I cannot be stumbling you cannot be stumbling she cannot be stumbling we cannot be stumbling you cannot be stumbling they cannot be stumbling |
Perfect | V-ing perfect |
I cannot have stumbled you cannot have stumbled she cannot have stumbled we cannot have stumbled you cannot have stumbled they cannot have stumbled | I cannot have been stumbling you cannot have been stumbling she cannot have been stumbling we cannot have been stumbling you cannot have been stumbling they cannot have been stumbling |
Simple form | V-ing form |
can I stumble? can you stumble? can she stumble? can we stumble? can you stumble? can they stumble? | can I be stumbling? can you be stumbling? can she 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 she 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 she have been stumbling? can we have been stumbling? can you have been stumbling? can they have been stumbling? |
Simple form | V-ing form |
can I not stumble? can you not stumble? can she not stumble? can we not stumble? can you not stumble? can they not stumble? | can I not be stumbling? can you not be stumbling? can she not be stumbling? can we not be stumbling? can you not be stumbling? can they not be stumbling? |
Perfect | V-ing perfect |
can I not have stumbled? can you not have stumbled? can she not have stumbled? can we not have stumbled? can you not have stumbled? can they not have stumbled? | can I not have been stumbling? can you not have been stumbling? can she not have been stumbling? can we not have been stumbling? can you not have been stumbling? can they not have been stumbling? |