[Mesorah] Poetic yud at the end of words

[Zev Sero]

In the first two chapters of Hallel we have "hamagbihi", "hamashpili",
"mekimi", "lehoshivi", "moshivi", "chuli", "hahofchi".   What is this
grammatical form?  Does the extra yud affect the meaning in any way?
Does this form appear anywhere else?

-- 
Zev Sero                      The trouble with socialism is that you
zev at sero.name                 eventually run out of other people’s money
                                                     - Margaret Thatcher