I can fend you can fend she can fend we can fend you can fend they can fend
V-ing form
I can be fending you can be fending she can be fending we can be fending you can be fending they can be fending
Perfect
I can have fended you can have fended she can have fended we can have fended you can have fended they can have fended
V-ing perfect
I can have been fending you can have been fending she can have been fending we can have been fending you can have been fending they can have been fending
Negation
Simple form
I can't fend you can't fend she can't fend we can't fend you can't fend they can't fend
V-ing form
I can't be fending you can't be fending she can't be fending we can't be fending you can't be fending they can't be fending
Perfect
I can't have fended you can't have fended she can't have fended we can't have fended you can't have fended they can't have fended
V-ing perfect
I can't have been fending you can't have been fending she can't have been fending we can't have been fending you can't have been fending they can't have been fending
Interrogative form
Simple form
can I fend? can you fend? can she fend? can we fend? can you fend? can they fend?
V-ing form
can I be fending? can you be fending? can she be fending? can we be fending? can you be fending? can they be fending?
Perfect
can I have fended? can you have fended? can she have fended? can we have fended? can you have fended? can they have fended?
V-ing perfect
can I have been fending? can you have been fending? can she have been fending? can we have been fending? can you have been fending? can they have been fending?
Interro-negative form
Simple form
can't I fend? can't you fend? can't she fend? can't we fend? can't you fend? can't they fend?
V-ing form
can't I be fending? can't you be fending? can't she be fending? can't we be fending? can't you be fending? can't they be fending?
Perfect
can't I have fended? can't you have fended? can't she have fended? can't we have fended? can't you have fended? can't they have fended?
V-ing perfect
can't I have been fending? can't you have been fending? can't she have been fending? can't we have been fending? can't you have been fending? can't they have been fending?