English verb conjugation
COULD LIAISE

Regular verb: liaise - liaised - liaised

Affirmation

Simple form	V-ing form
I could liaise you could liaise he could liaise we could liaise you could liaise they could liaise	I could be liaising you could be liaising he could be liaising we could be liaising you could be liaising they could be liaising
Perfect	V-ing perfect
I could have liaised you could have liaised he could have liaised we could have liaised you could have liaised they could have liaised	I could have been liaising you could have been liaising he could have been liaising we could have been liaising you could have been liaising they could have been liaising

Negation

Simple form	V-ing form
I couldn't liaise you couldn't liaise he couldn't liaise we couldn't liaise you couldn't liaise they couldn't liaise	I couldn't be liaising you couldn't be liaising he couldn't be liaising we couldn't be liaising you couldn't be liaising they couldn't be liaising
Perfect	V-ing perfect
I couldn't have liaised you couldn't have liaised he couldn't have liaised we couldn't have liaised you couldn't have liaised they couldn't have liaised	I couldn't have been liaising you couldn't have been liaising he couldn't have been liaising we couldn't have been liaising you couldn't have been liaising they couldn't have been liaising

Interrogative form

Simple form	V-ing form
could I liaise? could you liaise? could he liaise? could we liaise? could you liaise? could they liaise?	could I be liaising? could you be liaising? could he be liaising? could we be liaising? could you be liaising? could they be liaising?
Perfect	V-ing perfect
could I have liaised? could you have liaised? could he have liaised? could we have liaised? could you have liaised? could they have liaised?	could I have been liaising? could you have been liaising? could he have been liaising? could we have been liaising? could you have been liaising? could they have been liaising?

Interro-negative form

Simple form	V-ing form
couldn't I liaise? couldn't you liaise? couldn't he liaise? couldn't we liaise? couldn't you liaise? couldn't they liaise?	couldn't I be liaising? couldn't you be liaising? couldn't he be liaising? couldn't we be liaising? couldn't you be liaising? couldn't they be liaising?
Perfect	V-ing perfect
couldn't I have liaised? couldn't you have liaised? couldn't he have liaised? couldn't we have liaised? couldn't you have liaised? couldn't they have liaised?	couldn't I have been liaising? couldn't you have been liaising? couldn't he have been liaising? couldn't we have been liaising? couldn't you have been liaising? couldn't they have been liaising?