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 couldn't shipwreck you couldn't shipwreck he couldn't shipwreck we couldn't shipwreck you couldn't shipwreck they couldn't shipwreck
V-ing form
I couldn't be shipwrecking you couldn't be shipwrecking he couldn't be shipwrecking we couldn't be shipwrecking you couldn't be shipwrecking they couldn't be shipwrecking
Perfect
I couldn't have shipwrecked you couldn't have shipwrecked he couldn't have shipwrecked we couldn't have shipwrecked you couldn't have shipwrecked they couldn't have shipwrecked
V-ing perfect
I couldn't have been shipwrecking you couldn't have been shipwrecking he couldn't have been shipwrecking we couldn't have been shipwrecking you couldn't have been shipwrecking they couldn't 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
couldn't I shipwreck? couldn't you shipwreck? couldn't he shipwreck? couldn't we shipwreck? couldn't you shipwreck? couldn't they shipwreck?
V-ing form
couldn't I be shipwrecking? couldn't you be shipwrecking? couldn't he be shipwrecking? couldn't we be shipwrecking? couldn't you be shipwrecking? couldn't they be shipwrecking?
Perfect
couldn't I have shipwrecked? couldn't you have shipwrecked? couldn't he have shipwrecked? couldn't we have shipwrecked? couldn't you have shipwrecked? couldn't they have shipwrecked?
V-ing perfect
couldn't I have been shipwrecking? couldn't you have been shipwrecking? couldn't he have been shipwrecking? couldn't we have been shipwrecking? couldn't you have been shipwrecking? couldn't they have been shipwrecking?