| Code | Explanation | Example |
| C1 invitation | New topics are inconsistent with the previous ones and have a sense of sharing | Example 1, M: I have flowers. C: Mom, what is that? Example 2, M: This is a lamb. C: What’s in the kitchen? Example 3, M: Here is the carriage. C: The door is closed (the door of the carriage) |
| C2 answers | The child responded to the mother’s question within five seconds | Example 1, M: What color is it? C: Blue. Example 2, M: Go to the beach in the afternoon. C: The beach. Example 3, M: Mom is here. C: Here. |
| C3 expands | Provide at least one new piece of information about the topic currently under discussion | Example 1, C: Little brother going to sleep - M: going to sleep - C: eyes closed (expanded). Example 2, C: This is a fish - C: Small fish swimming (expanded). |
| C4 repairs | The child adds to his or her own or his or her mother’s words. | Example 1, M: Where is the kitchen? -C: Over here -C: This side is all kitchen (repair). Example 2, C: xxx -M: What did you say? -C: calf (repair). Example 3, C: Crying - M: Who is crying? -C: Doll (mend). |
| C5 non-answer | The mother asks a question, and the child does not answer within five seconds without answering | Example 1, M: What are you doing? -C: 0. (child does not answer within five seconds) |
| C6 idiosyncratic conversation | Words that do not fit the subject matter or are incomprehensible | Example 1, M: Look at the beautiful fish mom drew -C: To give it a place to live (idiosyncratic conversation) Example 2, M: Do you like it? -C: Eat, eat, eat, eat, eat. (idiosyncratic conversation) |