English verb conjugation
CAN FAST

Regular verb: fast - fasted - fasted

Affirmation

Simple form	V-ing form
I can fast you can fast he can fast we can fast you can fast they can fast	I can be fasting you can be fasting he can be fasting we can be fasting you can be fasting they can be fasting
Perfect	V-ing perfect
I can have fasted you can have fasted he can have fasted we can have fasted you can have fasted they can have fasted	I can have been fasting you can have been fasting he can have been fasting we can have been fasting you can have been fasting they can have been fasting

Negation

Simple form	V-ing form
I can't fast you can't fast he can't fast we can't fast you can't fast they can't fast	I can't be fasting you can't be fasting he can't be fasting we can't be fasting you can't be fasting they can't be fasting
Perfect	V-ing perfect
I can't have fasted you can't have fasted he can't have fasted we can't have fasted you can't have fasted they can't have fasted	I can't have been fasting you can't have been fasting he can't have been fasting we can't have been fasting you can't have been fasting they can't have been fasting

Interrogative form

Simple form	V-ing form
can I fast? can you fast? can he fast? can we fast? can you fast? can they fast?	can I be fasting? can you be fasting? can he be fasting? can we be fasting? can you be fasting? can they be fasting?
Perfect	V-ing perfect
can I have fasted? can you have fasted? can he have fasted? can we have fasted? can you have fasted? can they have fasted?	can I have been fasting? can you have been fasting? can he have been fasting? can we have been fasting? can you have been fasting? can they have been fasting?

Interro-negative form

Simple form	V-ing form
can't I fast? can't you fast? can't he fast? can't we fast? can't you fast? can't they fast?	can't I be fasting? can't you be fasting? can't he be fasting? can't we be fasting? can't you be fasting? can't they be fasting?
Perfect	V-ing perfect
can't I have fasted? can't you have fasted? can't he have fasted? can't we have fasted? can't you have fasted? can't they have fasted?	can't I have been fasting? can't you have been fasting? can't he have been fasting? can't we have been fasting? can't you have been fasting? can't they have been fasting?