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