I can turtle you can turtle he can turtle we can turtle you can turtle they can turtle
V-ing form
I can be turtling you can be turtling he can be turtling we can be turtling you can be turtling they can be turtling
Perfect
I can have turtled you can have turtled he can have turtled we can have turtled you can have turtled they can have turtled
V-ing perfect
I can have been turtling you can have been turtling he can have been turtling we can have been turtling you can have been turtling they can have been turtling
Negation
Simple form
I can't turtle you can't turtle he can't turtle we can't turtle you can't turtle they can't turtle
V-ing form
I can't be turtling you can't be turtling he can't be turtling we can't be turtling you can't be turtling they can't be turtling
Perfect
I can't have turtled you can't have turtled he can't have turtled we can't have turtled you can't have turtled they can't have turtled
V-ing perfect
I can't have been turtling you can't have been turtling he can't have been turtling we can't have been turtling you can't have been turtling they can't have been turtling
Interrogative form
Simple form
can I turtle? can you turtle? can he turtle? can we turtle? can you turtle? can they turtle?
V-ing form
can I be turtling? can you be turtling? can he be turtling? can we be turtling? can you be turtling? can they be turtling?
Perfect
can I have turtled? can you have turtled? can he have turtled? can we have turtled? can you have turtled? can they have turtled?
V-ing perfect
can I have been turtling? can you have been turtling? can he have been turtling? can we have been turtling? can you have been turtling? can they have been turtling?
Interro-negative form
Simple form
can't I turtle? can't you turtle? can't he turtle? can't we turtle? can't you turtle? can't they turtle?
V-ing form
can't I be turtling? can't you be turtling? can't he be turtling? can't we be turtling? can't you be turtling? can't they be turtling?
Perfect
can't I have turtled? can't you have turtled? can't he have turtled? can't we have turtled? can't you have turtled? can't they have turtled?
V-ing perfect
can't I have been turtling? can't you have been turtling? can't he have been turtling? can't we have been turtling? can't you have been turtling? can't they have been turtling?