A speaker checks every grammar rule, making talk very slow. This is:

1. The Monitor works only when the speaker has time and is focused on correctness. 2. Using it has a price: attention goes to form rather than meaning. 3. This slows the flow of conversation and reduces the information exchanged. 4. Some speakers over-monitor until the conversation is painfully slow and hard to listen to. 5. Krashen therefore advises using the Monitor when it does not interfere with communication, such as in writing. 6. So the described behaviour is over-use of the Monitor. **Why the other options fail:** - A raised affective filter is caused by anxiety and blocks input, not by checking rules. - The natural order effect concerns the sequence of acquisition. - Comprehensible output is the result of acquisition, not a pause for checking. _Source: Wikipedia, "Input hypothesis", section "Difficulties using the monitor" (revision 1380165607)_