I don't stumble you don't stumble he doesn't stumble we don't stumble you don't stumble they don't stumble
Present continuous
I'm not stumbling you aren't stumbling he isn't stumbling we aren't stumbling you aren't stumbling they aren't stumbling
Preterite
I didn't stumble you didn't stumble he didn't stumble we didn't stumble you didn't stumble they didn't stumble
Preterite continuous
I wasn't stumbling you weren't stumbling he wasn't stumbling we weren't stumbling you weren't stumbling they weren't stumbling
Present perfect
I haven't stumbled you haven't stumbled he hasn't stumbled we haven't stumbled you haven't stumbled they haven't stumbled
Present perfect continuous
I haven't been stumbling you haven't been stumbling he hasn't been stumbling we haven't been stumbling you haven't been stumbling they haven't been stumbling
Pluperfect
I hadn't stumbled you hadn't stumbled he hadn't stumbled we hadn't stumbled you hadn't stumbled they hadn't stumbled
Pluperfect continuous
I hadn't been stumbling you hadn't been stumbling he hadn't been stumbling we hadn't been stumbling you hadn't been stumbling they hadn't been stumbling
Future
I won't stumble you won't stumble he won't stumble we won't stumble you won't stumble they won't stumble
Future continuous
I won't be stumbling you won't be stumbling he won't be stumbling we won't be stumbling you won't be stumbling they won't be stumbling
Future perfect
I won't have stumbled you won't have stumbled he won't have stumbled we won't have stumbled you won't have stumbled they won't have stumbled
Future perfect continuous
I won't have been stumbling you won't have been stumbling he won't have been stumbling we won't have been stumbling you won't have been stumbling they won't have been stumbling
Conditional
Present
I wouldn't stumble you wouldn't stumble he wouldn't stumble we wouldn't stumble you wouldn't stumble they wouldn't stumble
Present continuous
I wouldn't be stumbling you wouldn't be stumbling he wouldn't be stumbling we wouldn't be stumbling you wouldn't be stumbling they wouldn't be stumbling
Past
I wouldn't have stumbled you wouldn't have stumbled he wouldn't have stumbled we wouldn't have stumbled you wouldn't have stumbled they wouldn't have stumbled
Past continuous
I wouldn't have been stumbling you wouldn't have been stumbling he wouldn't have been stumbling we wouldn't have been stumbling you wouldn't have been stumbling they wouldn't have been stumbling