I could shipwreck you could shipwreck he could shipwreck we could shipwreck you could shipwreck they could shipwreck
V-ing form
I could be shipwrecking you could be shipwrecking he could be shipwrecking we could be shipwrecking you could be shipwrecking they could be shipwrecking
Perfect
I could have shipwrecked you could have shipwrecked he could have shipwrecked we could have shipwrecked you could have shipwrecked they could have shipwrecked
V-ing perfect
I could have been shipwrecking you could have been shipwrecking he could have been shipwrecking we could have been shipwrecking you could have been shipwrecking they could have been shipwrecking
Negation
Simple form
I could not shipwreck you could not shipwreck he could not shipwreck we could not shipwreck you could not shipwreck they could not shipwreck
V-ing form
I could not be shipwrecking you could not be shipwrecking he could not be shipwrecking we could not be shipwrecking you could not be shipwrecking they could not be shipwrecking
Perfect
I could not have shipwrecked you could not have shipwrecked he could not have shipwrecked we could not have shipwrecked you could not have shipwrecked they could not have shipwrecked
V-ing perfect
I could not have been shipwrecking you could not have been shipwrecking he could not have been shipwrecking we could not have been shipwrecking you could not have been shipwrecking they could not have been shipwrecking
Interrogative form
Simple form
could I shipwreck? could you shipwreck? could he shipwreck? could we shipwreck? could you shipwreck? could they shipwreck?
V-ing form
could I be shipwrecking? could you be shipwrecking? could he be shipwrecking? could we be shipwrecking? could you be shipwrecking? could they be shipwrecking?
Perfect
could I have shipwrecked? could you have shipwrecked? could he have shipwrecked? could we have shipwrecked? could you have shipwrecked? could they have shipwrecked?
V-ing perfect
could I have been shipwrecking? could you have been shipwrecking? could he have been shipwrecking? could we have been shipwrecking? could you have been shipwrecking? could they have been shipwrecking?
Interro-negative form
Simple form
could I not shipwreck? could you not shipwreck? could he not shipwreck? could we not shipwreck? could you not shipwreck? could they not shipwreck?
V-ing form
could I not be shipwrecking? could you not be shipwrecking? could he not be shipwrecking? could we not be shipwrecking? could you not be shipwrecking? could they not be shipwrecking?
Perfect
could I not have shipwrecked? could you not have shipwrecked? could he not have shipwrecked? could we not have shipwrecked? could you not have shipwrecked? could they not have shipwrecked?
V-ing perfect
could I not have been shipwrecking? could you not have been shipwrecking? could he not have been shipwrecking? could we not have been shipwrecking? could you not have been shipwrecking? could they not have been shipwrecking?