Why are missing words sometimes placed within square brackets and sometimes not?

[Zhuo (Cindy) Chen]

Dear CHIBOLTS,

I'm working with Manchester corpus. I found that the missing words 
sometimes are placed within square brackets (regarded as error) and 
sometimes not. 

For example, in Anne 01b, I found the utterance as presented below, where 
the missing word is not bracketed, 

*CHI:	it 0is stuck .

%mor:	pro|it 0aux|is v|stick&PAST .

%gra:	1|3|LINK 2|3|SUBJ 3|0|ROOT 4|3|PUNCT


In Anne 01b (the same file), I found another utterance, where the missing word is placed within square brackets. 

*CHI:	baby [* 0is] stuck .
%mor:	n|baby v|stick&PAST .
%gra:	1|2|SUBJ 2|0|ROOT 3|2|PUNCT


The thing is, when the missing word is placed within square brackets, you would not tag it in the mor tier or the grasp tier. When it is not in the brackets, you tag it in the mor tier and in the grasp tier. I don't know why this is done in an inconsistent way. 


Thanks,

Cindy

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