
Irregular verb: understand - understood - understood
Present | Present continuous | Preterite | Preterite continuous | 
|  do I understand? do you understand? does he understand? do we understand? do you understand? do they understand?  |  am I understanding? are you understanding? is he understanding? are we understanding? are you understanding? are they understanding?  | did I understand? did you understand? did he understand? did we understand? did you understand? did they understand?  |  was I understanding? were you understanding? was he understanding? were we understanding? were you understanding? were they understanding?  | 
Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous | 
|  have I understood? have you understood? has he understood? have we understood? have you understood? have they understood?  |  have I been understanding? have you been understanding? has he been understanding? have we been understanding? have you been understanding? have they been understanding?  | had I understood? had you understood? had he understood? had we understood? had you understood? had they understood?  | had I been understanding? had you been understanding? had he been understanding? had we been understanding? had you been understanding? had they been understanding?  | 
Future | Future continuous | Future perfect | Future perfect continuous | 
|  will I understand? will you understand? will he understand? will we understand? will you understand? will they understand?  |  will I be understanding? will you be understanding? will he be understanding? will we be understanding? will you be understanding? will they be understanding?  |  will I have understood? will you have understood? will he have understood? will we have understood? will you have understood? will they have understood?  |  will I have been understanding? will you have been understanding? will he have been understanding? will we have been understanding? will you have been understanding? will they have been understanding?  | 
Present | Present continuous | Past | Past continuous | 
|  would I understand? would you understand? would he understand? would we understand? would you understand? would they understand?  |  would I be understanding? would you be understanding? would he be understanding? would we be understanding? would you be understanding? would they be understanding?  |  would I have understood? would you have understood? would he have understood? would we have understood? would you have understood? would they have understood?  |  would I have been understanding? would you have been understanding? would he have been understanding? would we have been understanding? would you have been understanding? would they have been understanding?  | 
Infinitive | Imperative | 
Infinitive | Imperative | ||
| to understand | - - -  | 
Present | Past | ||
| understanding | understood |