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