I could evanesce you could evanesce he could evanesce we could evanesce you could evanesce they could evanesce
V-ing form
I could be evanescing you could be evanescing he could be evanescing we could be evanescing you could be evanescing they could be evanescing
Perfect
I could have evanesced you could have evanesced he could have evanesced we could have evanesced you could have evanesced they could have evanesced
V-ing perfect
I could have been evanescing you could have been evanescing he could have been evanescing we could have been evanescing you could have been evanescing they could have been evanescing
Negation
Simple form
I couldn't evanesce you couldn't evanesce he couldn't evanesce we couldn't evanesce you couldn't evanesce they couldn't evanesce
V-ing form
I couldn't be evanescing you couldn't be evanescing he couldn't be evanescing we couldn't be evanescing you couldn't be evanescing they couldn't be evanescing
Perfect
I couldn't have evanesced you couldn't have evanesced he couldn't have evanesced we couldn't have evanesced you couldn't have evanesced they couldn't have evanesced
V-ing perfect
I couldn't have been evanescing you couldn't have been evanescing he couldn't have been evanescing we couldn't have been evanescing you couldn't have been evanescing they couldn't have been evanescing
Interrogative form
Simple form
could I evanesce? could you evanesce? could he evanesce? could we evanesce? could you evanesce? could they evanesce?
V-ing form
could I be evanescing? could you be evanescing? could he be evanescing? could we be evanescing? could you be evanescing? could they be evanescing?
Perfect
could I have evanesced? could you have evanesced? could he have evanesced? could we have evanesced? could you have evanesced? could they have evanesced?
V-ing perfect
could I have been evanescing? could you have been evanescing? could he have been evanescing? could we have been evanescing? could you have been evanescing? could they have been evanescing?
Interro-negative form
Simple form
couldn't I evanesce? couldn't you evanesce? couldn't he evanesce? couldn't we evanesce? couldn't you evanesce? couldn't they evanesce?
V-ing form
couldn't I be evanescing? couldn't you be evanescing? couldn't he be evanescing? couldn't we be evanescing? couldn't you be evanescing? couldn't they be evanescing?
Perfect
couldn't I have evanesced? couldn't you have evanesced? couldn't he have evanesced? couldn't we have evanesced? couldn't you have evanesced? couldn't they have evanesced?
V-ing perfect
couldn't I have been evanescing? couldn't you have been evanescing? couldn't he have been evanescing? couldn't we have been evanescing? couldn't you have been evanescing? couldn't they have been evanescing?