I could prospect you could prospect she could prospect we could prospect you could prospect they could prospect
V-ing form
I could be prospecting you could be prospecting she could be prospecting we could be prospecting you could be prospecting they could be prospecting
Perfect
I could have prospected you could have prospected she could have prospected we could have prospected you could have prospected they could have prospected
V-ing perfect
I could have been prospecting you could have been prospecting she could have been prospecting we could have been prospecting you could have been prospecting they could have been prospecting
Negation
Simple form
I couldn't prospect you couldn't prospect she couldn't prospect we couldn't prospect you couldn't prospect they couldn't prospect
V-ing form
I couldn't be prospecting you couldn't be prospecting she couldn't be prospecting we couldn't be prospecting you couldn't be prospecting they couldn't be prospecting
Perfect
I couldn't have prospected you couldn't have prospected she couldn't have prospected we couldn't have prospected you couldn't have prospected they couldn't have prospected
V-ing perfect
I couldn't have been prospecting you couldn't have been prospecting she couldn't have been prospecting we couldn't have been prospecting you couldn't have been prospecting they couldn't have been prospecting
Interrogative form
Simple form
could I prospect? could you prospect? could she prospect? could we prospect? could you prospect? could they prospect?
V-ing form
could I be prospecting? could you be prospecting? could she be prospecting? could we be prospecting? could you be prospecting? could they be prospecting?
Perfect
could I have prospected? could you have prospected? could she have prospected? could we have prospected? could you have prospected? could they have prospected?
V-ing perfect
could I have been prospecting? could you have been prospecting? could she have been prospecting? could we have been prospecting? could you have been prospecting? could they have been prospecting?
Interro-negative form
Simple form
couldn't I prospect? couldn't you prospect? couldn't she prospect? couldn't we prospect? couldn't you prospect? couldn't they prospect?
V-ing form
couldn't I be prospecting? couldn't you be prospecting? couldn't she be prospecting? couldn't we be prospecting? couldn't you be prospecting? couldn't they be prospecting?
Perfect
couldn't I have prospected? couldn't you have prospected? couldn't she have prospected? couldn't we have prospected? couldn't you have prospected? couldn't they have prospected?
V-ing perfect
couldn't I have been prospecting? couldn't you have been prospecting? couldn't she have been prospecting? couldn't we have been prospecting? couldn't you have been prospecting? couldn't they have been prospecting?