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 cannot liaise you cannot liaise he cannot liaise we cannot liaise you cannot liaise they cannot liaise
V-ing form
I cannot be liaising you cannot be liaising he cannot be liaising we cannot be liaising you cannot be liaising they cannot be liaising
Perfect
I cannot have liaised you cannot have liaised he cannot have liaised we cannot have liaised you cannot have liaised they cannot have liaised
V-ing perfect
I cannot have been liaising you cannot have been liaising he cannot have been liaising we cannot have been liaising you cannot have been liaising they cannot 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 I not liaise? can you not liaise? can he not liaise? can we not liaise? can you not liaise? can they not liaise?
V-ing form
can I not be liaising? can you not be liaising? can he not be liaising? can we not be liaising? can you not be liaising? can they not be liaising?
Perfect
can I not have liaised? can you not have liaised? can he not have liaised? can we not have liaised? can you not have liaised? can they not have liaised?
V-ing perfect
can I not have been liaising? can you not have been liaising? can he not have been liaising? can we not have been liaising? can you not have been liaising? can they not have been liaising?