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