The sentence to ask the teacher to be more careful is as follows:

1. Since ancient times, strict teachers have produced great disciples. Without today’s training, there will be no success tomorrow. I hope the teacher will pay more attention to strict discipline. Thank you for your support. Hard work.

2. Your mind is as boundless as the sky, and your kindness is as deep as the mountains. Children will not lose their way because of your guidance along the way. Children's minds are not mature enough, so I hope you will spend more time teaching them.

3. Although I cannot say thank you enough, your help to my children cannot be expressed in words. Thank you for your efforts.

4. Teacher, you are the most unforgettable person in my and my child’s life. Because of you, my child fell in love with learning. Because of your education, my child’s life has taken a good turn. You have taken the trouble to Yes, we are forever grateful to you.

5. Dear teacher, my child is lively and sometimes naughty. I ask you to educate me more at school. I have caused you trouble. Thank you.