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 cannot sow you cannot sow he cannot sow we cannot sow you cannot sow they cannot sow
V-ing form
I cannot be sowing you cannot be sowing he cannot be sowing we cannot be sowing you cannot be sowing they cannot be sowing
Perfect
I cannot have sown, sowed you cannot have sown, sowed he cannot have sown, sowed we cannot have sown, sowed you cannot have sown, sowed they cannot have sown, sowed
V-ing perfect
I cannot have been sowing you cannot have been sowing he cannot have been sowing we cannot have been sowing you cannot have been sowing they cannot 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 I not sow? can you not sow? can he not sow? can we not sow? can you not sow? can they not sow?
V-ing form
can I not be sowing? can you not be sowing? can he not be sowing? can we not be sowing? can you not be sowing? can they not be sowing?
Perfect
can I not have sown, sowed? can you not have sown, sowed? can he not have sown, sowed? can we not have sown, sowed? can you not have sown, sowed? can they not have sown, sowed?
V-ing perfect
can I not have been sowing? can you not have been sowing? can he not have been sowing? can we not have been sowing? can you not have been sowing? can they not have been sowing?