I don't understand you don't understand he doesn't understand we don't understand you don't understand they don't understand
Present continuous
I'm not understanding you aren't understanding he isn't understanding we aren't understanding you aren't understanding they aren't understanding
Preterite
I didn't understand you didn't understand he didn't understand we didn't understand you didn't understand they didn't understand
Preterite continuous
I wasn't understanding you weren't understanding he wasn't understanding we weren't understanding you weren't understanding they weren't understanding
Present perfect
I haven't understood you haven't understood he hasn't understood we haven't understood you haven't understood they haven't understood
Present perfect continuous
I haven't been understanding you haven't been understanding he hasn't been understanding we haven't been understanding you haven't been understanding they haven't been understanding
Pluperfect
I hadn't understood you hadn't understood he hadn't understood we hadn't understood you hadn't understood they hadn't understood
Pluperfect continuous
I hadn't been understanding you hadn't been understanding he hadn't been understanding we hadn't been understanding you hadn't been understanding they hadn't been understanding
Future
I won't understand you won't understand he won't understand we won't understand you won't understand they won't understand
Future continuous
I won't be understanding you won't be understanding he won't be understanding we won't be understanding you won't be understanding they won't be understanding
Future perfect
I won't have understood you won't have understood he won't have understood we won't have understood you won't have understood they won't have understood
Future perfect continuous
I won't have been understanding you won't have been understanding he won't have been understanding we won't have been understanding you won't have been understanding they won't have been understanding
Conditional
Present
I wouldn't understand you wouldn't understand he wouldn't understand we wouldn't understand you wouldn't understand they wouldn't understand
Present continuous
I wouldn't be understanding you wouldn't be understanding he wouldn't be understanding we wouldn't be understanding you wouldn't be understanding they wouldn't be understanding
Past
I wouldn't have understood you wouldn't have understood he wouldn't have understood we wouldn't have understood you wouldn't have understood they wouldn't have understood
Past continuous
I wouldn't have been understanding you wouldn't have been understanding he wouldn't have been understanding we wouldn't have been understanding you wouldn't have been understanding they wouldn't have been understanding
Imperative
Imperative
do not understand Let's not understand do not understand