The LanguageScreen questions are designed to measure a child's ability to hear and then repeat a sentence or name an object. If a child has a problem that is purely articulatory you can credit their response as correct if the way they articulate a sound is consistent with their speech system - so if a child consistently misarticulates "b" as "d" if they say "bus" as "dus" they do not lose a mark.
So for example if the child says "zhh tesher pamised the boy a shicker" (the teacher promised the boy a sticker) the child has encoded the sentence correctly (no words or morphemes omitted or altered) but the sounds are not well articulated. That child can be credited with getting the item correct.
If on the other hand they have omitted part of the word e.g. The dog run away, rather than, The dog runs away, the child has omitted a morpheme which makes their answer incorrect.