Coniugazione del verbo inglese
CAN HAPPEN

Verbo regolare: happen - happened - happened

Affermazione

Forma semplice	Forma con V-ing
- - it can happen - - -	- - it can be happening - - -
Perfetto	Perfetto con V-ing
- - it can have happened - - -	- - it can have been happening - - -

Negazione

Forma semplice	Forma con V-ing
- - it can't happen - - -	- - it can't be happening - - -
Perfetto	Perfetto con V-ing
- - it can't have happened - - -	- - it can't have been happening - - -

Forma interrogativa

Forma semplice	Forma con V-ing
- - can it happen? - - -	- - can it be happening? - - -
Perfetto	Perfetto con V-ing
- - can it have happened? - - -	- - can it have been happening? - - -

Forma interro-negativa

Forma semplice	Forma con V-ing
- - can't it happen? - - -	- - can't it be happening? - - -
Perfetto	Perfetto con V-ing
- - can't it have happened? - - -	- - can't it have been happening? - - -