
Verbo regular: stack - stacked - stacked
Presente | Presente continuo | Pretérito | Pretérito continuo | 
| I stack you stack she stacks we stack you stack they stack  | I'm stacking you're stacking she's stacking we're stacking you're stacking they're stacking  | I stacked you stacked she stacked we stacked you stacked they stacked  | I was stacking you were stacking she was stacking we were stacking you were stacking they were stacking  | 
Presente perfecto | Presente perfecto continuo | Pluscuamperfecto | Pluscuamperfecto continuo | 
| I've stacked you've stacked she's stacked we've stacked you've stacked they've stacked  | I've been stacking you've been stacking she's been stacking we've been stacking you've been stacking they've been stacking  | I'd stacked you'd stacked she'd stacked we'd stacked you'd stacked they'd stacked  | I'd been stacking you'd been stacking she'd been stacking we'd been stacking you'd been stacking they'd been stacking  | 
Futuro simple | Futuro continuo | Futuro perfecto | Futuro perfecto contínuo | 
| I'll stack you'll stack she'll stack we'll stack you'll stack they'll stack  | I'll be stacking you'll be stacking she'll be stacking we'll be stacking you'll be stacking they'll be stacking  | I'll have stacked you'll have stacked she'll have stacked we'll have stacked you'll have stacked they'll have stacked  | I'll have been stacking you'll have been stacking she'll have been stacking we'll have been stacking you'll have been stacking they'll have been stacking  | 
Presente | Presente continuo | Passado | Passado continuo | 
| I'd stack you'd stack she'd stack we'd stack you'd stack they'd stack  | I'd be stacking you'd be stacking she'd be stacking we'd be stacking you'd be stacking they'd be stacking  | I'd have stacked you'd have stacked she'd have stacked we'd have stacked you'd have stacked they'd have stacked  | I'd have been stacking you'd have been stacking she'd have been stacking we'd have been stacking you'd have been stacking they'd have been stacking  | 
Infinitivo | Imperativo | 
Infinitivo | Imperativo | ||
| to stack | stack Let's stack stack  | 
Presente | Passado | ||
| stacking | stacked |