I can sow you can sow he can sow we can sow you can sow they can sow
V-ing form
I can be sowing you can be sowing he can be sowing we can be sowing you can be sowing they can be sowing
Perfect
I can have sown, sowed you can have sown, sowed he can have sown, sowed we can have sown, sowed you can have sown, sowed they can have sown, sowed
V-ing perfect
I can have been sowing you can have been sowing he can have been sowing we can have been sowing you can have been sowing they can have been sowing
Negation
Simple form
I can't sow you can't sow he can't sow we can't sow you can't sow they can't sow
V-ing form
I can't be sowing you can't be sowing he can't be sowing we can't be sowing you can't be sowing they can't be sowing
Perfect
I can't have sown, sowed you can't have sown, sowed he can't have sown, sowed we can't have sown, sowed you can't have sown, sowed they can't have sown, sowed
V-ing perfect
I can't have been sowing you can't have been sowing he can't have been sowing we can't have been sowing you can't have been sowing they can't have been sowing
Interrogative form
Simple form
can I sow? can you sow? can he sow? can we sow? can you sow? can they sow?
V-ing form
can I be sowing? can you be sowing? can he be sowing? can we be sowing? can you be sowing? can they be sowing?
Perfect
can I have sown, sowed? can you have sown, sowed? can he have sown, sowed? can we have sown, sowed? can you have sown, sowed? can they have sown, sowed?
V-ing perfect
can I have been sowing? can you have been sowing? can he have been sowing? can we have been sowing? can you have been sowing? can they have been sowing?
Interro-negative form
Simple form
can't I sow? can't you sow? can't he sow? can't we sow? can't you sow? can't they sow?
V-ing form
can't I be sowing? can't you be sowing? can't he be sowing? can't we be sowing? can't you be sowing? can't they be sowing?
Perfect
can't I have sown, sowed? can't you have sown, sowed? can't he have sown, sowed? can't we have sown, sowed? can't you have sown, sowed? can't they have sown, sowed?
V-ing perfect
can't I have been sowing? can't you have been sowing? can't he have been sowing? can't we have been sowing? can't you have been sowing? can't they have been sowing?