| I | stack |
| you | stack |
| he/she/it | stacks |
| we | stack |
| you | stack |
| they | stack |
| I | have stacked |
| you | have stacked |
| he/she/it | has stacked |
| we | have stacked |
| you | have stacked |
| they | have stacked |
| I | stacked |
| you | stacked |
| he/she/it | stacked |
| we | stacked |
| you | stacked |
| they | stacked |
| I | had stacked |
| you | had stacked |
| he/she/it | had stacked |
| we | had stacked |
| you | had stacked |
| they | had stacked |
| I | will stack |
| you | will stack |
| he/she/it | will stack |
| we | will stack |
| you | will stack |
| they | will stack |
| I | will have stacked |
| you | will have stacked |
| he/she/it | will have stacked |
| we | will have stacked |
| you | will have stacked |
| they | will have stacked |
| I | am stacking |
| you | are stacking |
| he/she/it | is stacking |
| we | are stacking |
| you | are stacking |
| they | are stacking |
| I | have been stacking |
| you | have been stacking |
| he/she/it | has been stacking |
| we | have been stacking |
| you | have been stacking |
| they | have been stacking |
| I | was stacking |
| you | were stacking |
| he/she/it | was stacking |
| we | were stacking |
| you | were stacking |
| they | were stacking |
| I | had been stacking |
| you | had been stacking |
| he/she/it | had been stacking |
| we | had been stacking |
| you | had been stacking |
| they | had been stacking |
| I | will be stacking |
| you | will be stacking |
| he/she/it | will be stacking |
| we | will be stacking |
| you | will be stacking |
| they | will be stacking |
| I | will have been stacking |
| you | will have been stacking |
| he/she/it | will have been stacking |
| we | will have been stacking |
| you | will have been stacking |
| they | will have been stacking |
| I | would stack |
| you | would stack |
| he/she/it | would stack |
| we | would stack |
| you | would stack |
| they | would stack |
| I | would have stacked |
| you | would have stacked |
| he/she/it | would have stacked |
| we | would have stacked |
| you | would have stacked |
| they | would have stacked |
| I | would be stacking |
| you | would be stacking |
| he/she/it | would be stacking |
| we | would be stacking |
| you | would be stacking |
| they | would be stacking |
| I | would have been stacking |
| you | would have been stacking |
| he/she/it | would have been stacking |
| we | would have been stacking |
| you | would have been stacking |
| they | would have been stacking |
| You | stack |
| we | Let's stack |
| You | stack |