It seems like you have a collection of sentences with notes or indicators of some sort at the end. The "ð" symbol appears after each sentence, which could be a placeholder or marker for something specific (like completion or clarity).

If you are looking for corrections or feedback on these sentences, here are some suggested revisions for clarity:

1. My mother doesn’t clean the floor every day. ✅
2. Mrs. Lan usually feeds the dog. ✅
3. Alexander Graham Bell invented the telephone in 1876. (Correction: "Alexandar" should be "Alexander.")
4. Nam repainted the school gate last week. ✅
5. Can people use the train a lot? ✅
6. Christopher Columbus discovered America in 1492. (Correction: Christopher Columbus, not Christopher, and the date is 1492, not 1949.)
7. Has Minh seen the accident on the road? ✅
8. My father told me a funny story last night. (Correction: "the funny story" can be changed to "a funny story" for smoother phrasing.)
9. The policeman took Lam to the police station. ✅
10. Mr. Ha repaired this machine yesterday. ✅
11. My mother kept the kitchen clean. (Correction: The correct phrase is "kept the kitchen clean.")

If you need more help or specific requirements for these sentences, please let me know!