I can tend you can tend she can tend we can tend you can tend they can tend
V-ing form
I can be tending you can be tending she can be tending we can be tending you can be tending they can be tending
Perfect
I can have tended you can have tended she can have tended we can have tended you can have tended they can have tended
V-ing perfect
I can have been tending you can have been tending she can have been tending we can have been tending you can have been tending they can have been tending
Negation
Simple form
I can't tend you can't tend she can't tend we can't tend you can't tend they can't tend
V-ing form
I can't be tending you can't be tending she can't be tending we can't be tending you can't be tending they can't be tending
Perfect
I can't have tended you can't have tended she can't have tended we can't have tended you can't have tended they can't have tended
V-ing perfect
I can't have been tending you can't have been tending she can't have been tending we can't have been tending you can't have been tending they can't have been tending
Interrogative form
Simple form
can I tend? can you tend? can she tend? can we tend? can you tend? can they tend?
V-ing form
can I be tending? can you be tending? can she be tending? can we be tending? can you be tending? can they be tending?
Perfect
can I have tended? can you have tended? can she have tended? can we have tended? can you have tended? can they have tended?
V-ing perfect
can I have been tending? can you have been tending? can she have been tending? can we have been tending? can you have been tending? can they have been tending?
Interro-negative form
Simple form
can't I tend? can't you tend? can't she tend? can't we tend? can't you tend? can't they tend?
V-ing form
can't I be tending? can't you be tending? can't she be tending? can't we be tending? can't you be tending? can't they be tending?
Perfect
can't I have tended? can't you have tended? can't she have tended? can't we have tended? can't you have tended? can't they have tended?
V-ing perfect
can't I have been tending? can't you have been tending? can't she have been tending? can't we have been tending? can't you have been tending? can't they have been tending?