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