English verb conjugation
CAN APPEND

Regular verb: append - appended - appended

Affirmation

Simple form	V-ing form
I can append you can append he can append we can append you can append they can append	I can be appending you can be appending he can be appending we can be appending you can be appending they can be appending
Perfect	V-ing perfect
I can have appended you can have appended he can have appended we can have appended you can have appended they can have appended	I can have been appending you can have been appending he can have been appending we can have been appending you can have been appending they can have been appending

Negation

Simple form	V-ing form
I can't append you can't append he can't append we can't append you can't append they can't append	I can't be appending you can't be appending he can't be appending we can't be appending you can't be appending they can't be appending
Perfect	V-ing perfect
I can't have appended you can't have appended he can't have appended we can't have appended you can't have appended they can't have appended	I can't have been appending you can't have been appending he can't have been appending we can't have been appending you can't have been appending they can't have been appending

Interrogative form

Simple form	V-ing form
can I append? can you append? can he append? can we append? can you append? can they append?	can I be appending? can you be appending? can he be appending? can we be appending? can you be appending? can they be appending?
Perfect	V-ing perfect
can I have appended? can you have appended? can he have appended? can we have appended? can you have appended? can they have appended?	can I have been appending? can you have been appending? can he have been appending? can we have been appending? can you have been appending? can they have been appending?

Interro-negative form

Simple form	V-ing form
can't I append? can't you append? can't he append? can't we append? can't you append? can't they append?	can't I be appending? can't you be appending? can't he be appending? can't we be appending? can't you be appending? can't they be appending?
Perfect	V-ing perfect
can't I have appended? can't you have appended? can't he have appended? can't we have appended? can't you have appended? can't they have appended?	can't I have been appending? can't you have been appending? can't he have been appending? can't we have been appending? can't you have been appending? can't they have been appending?