I wrote this sentence:
Wǒ de tóngwū shuìjiào shíhòu xiǎng kāi wūmén yīdiǎndiǎn.
It was meant to mean "when my roommate sleeps, they like to open the door a little". Our teacher 张老师 made these corrections:
So she corrected it to:
Question: What is wrong with my sentence?