I can tend you can tend he can tend we can tend you can tend they can tend
V-ing form
I can be tending you can be tending he can be tending we can be tending you can be tending they can be tending
Perfect
I can have tended you can have tended he 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 he 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 he 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 he 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 he 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 he 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 he tend? can we tend? can you tend? can they tend?
V-ing form
can I be tending? can you be tending? can he be tending? can we be tending? can you be tending? can they be tending?
Perfect
can I have tended? can you have tended? can he 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 he 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 he 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 he 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 he 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 he have been tending? can't we have been tending? can't you have been tending? can't they have been tending?