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