I can liaise you can liaise he can liaise we can liaise you can liaise they can liaise
V-ing form
I can be liaising you can be liaising he can be liaising we can be liaising you can be liaising they can be liaising
Perfect
I can have liaised you can have liaised he can have liaised we can have liaised you can have liaised they can have liaised
V-ing perfect
I can have been liaising you can have been liaising he can have been liaising we can have been liaising you can have been liaising they can have been liaising
Negation
Simple form
I can't liaise you can't liaise he can't liaise we can't liaise you can't liaise they can't liaise
V-ing form
I can't be liaising you can't be liaising he can't be liaising we can't be liaising you can't be liaising they can't be liaising
Perfect
I can't have liaised you can't have liaised he can't have liaised we can't have liaised you can't have liaised they can't have liaised
V-ing perfect
I can't have been liaising you can't have been liaising he can't have been liaising we can't have been liaising you can't have been liaising they can't have been liaising
Interrogative form
Simple form
can I liaise? can you liaise? can he liaise? can we liaise? can you liaise? can they liaise?
V-ing form
can I be liaising? can you be liaising? can he be liaising? can we be liaising? can you be liaising? can they be liaising?
Perfect
can I have liaised? can you have liaised? can he have liaised? can we have liaised? can you have liaised? can they have liaised?
V-ing perfect
can I have been liaising? can you have been liaising? can he have been liaising? can we have been liaising? can you have been liaising? can they have been liaising?
Interro-negative form
Simple form
can't I liaise? can't you liaise? can't he liaise? can't we liaise? can't you liaise? can't they liaise?
V-ing form
can't I be liaising? can't you be liaising? can't he be liaising? can't we be liaising? can't you be liaising? can't they be liaising?
Perfect
can't I have liaised? can't you have liaised? can't he have liaised? can't we have liaised? can't you have liaised? can't they have liaised?
V-ing perfect
can't I have been liaising? can't you have been liaising? can't he have been liaising? can't we have been liaising? can't you have been liaising? can't they have been liaising?