present
|
past
|
future
|
conditional
|
|
---|---|---|---|---|
s1 |
stack
|
stacked
|
will stack
|
would stack
|
s2 |
stack
|
stacked
|
will stack
|
would stack
|
s3 |
stacks
|
stacked
|
will stack
|
would stack
|
p1 |
stack
|
stacked
|
will stack
|
would stack
|
p2 |
stack
|
stacked
|
will stack
|
would stack
|
p3 |
stack
|
stacked
|
will stack
|
would stack
|
present
|
past
|
future
|
conditional
|
|
---|---|---|---|---|
s1 |
am stacking
|
was stacking
|
will be stacking
|
would be stacking
|
s2 |
are stacking
|
were stacking
|
will be stacking
|
would be stacking
|
s3 |
is stacking
|
was stacking
|
will be stacking
|
would be stacking
|
p1 |
are stacking
|
were stacking
|
will be stacking
|
would be stacking
|
p2 |
are stacking
|
were stacking
|
will be stacking
|
would be stacking
|
p3 |
are stacking
|
were stacking
|
will be stacking
|
would be stacking
|
present
|
past
|
future
|
conditional
|
|
---|---|---|---|---|
s1 |
have stacked
|
had stacked
|
will have stacked
|
would have stacked
|
s2 |
have stacked
|
had stacked
|
will have stacked
|
would have stacked
|
s3 |
has stacked
|
had stacked
|
will have stacked
|
would have stacked
|
p1 |
have stacked
|
had stacked
|
will have stacked
|
would have stacked
|
p2 |
have stacked
|
had stacked
|
will have stacked
|
would have stacked
|
p3 |
have stacked
|
had stacked
|
will have stacked
|
would have stacked
|
affirmative
|
negative
|
|
---|---|---|
s1 |
-
|
-
|
s2 |
stack
|
don't stack
|
s3 |
stack
|
don't stack
|
p1 |
stack
|
don't stack
|
p2 |
stack
|
don't stack
|
p3 |
stack
|
don't stack
|