What does 't ap' mean? Is it te ap or ta ap? Also, how do you form the past progressive? For example 'I was reading when I was interrupted.'

T'ap → te ap.


I was reading when I was interrupted.
Mwen te ap li lè yo te entewonp mwen. (non-contracted)
Mwen t'ap li lè yo te entewonp mwen. (contracted)

Links to using progressive forms in Creole.
PRESENT PROGRESSIVE
PROGRESSIVES AND CONTRACTIONS
PAST PROGRESSIVE PART 3
PROGRESSIVE FORM PART 4
PAST PROGRESSIVE WITH THE VERB ALE (TO GO)