1. I don't want to go see a doctor.
2. You didn't have to go to school.
3. There are many pens on the table.
4. What is there in the box?
5. The cat lies under that desk.
6. The post office is next to my house.
7. There is a Korean restaurant in front of the building.
8. Hiding behind me
Here, there is no subject. You might say, "A dog is hiding behind me." or "She is hiding behind me." However, this phrase is not a complete sentence as it is written.
9. Probably There's probably a bank across from the signal.
10. My house is around the corner from the alley.
11. When did you go shopping?
12. I'm tired of washing the dishes.
13. I'll sleep after taking a bath.
14. Who wants to take a shower first?
15. Did he do the laundry?
16. People should brush their teeth three times a day.
17. I like to work out in a fitness center.
18. I am going to home work
Here, you need to specify what you are talking about. If you are talking about doing work at your home, you can say, "I am going work from home." If you are talking about homework, you can say, "I am going to do homework."
19. It is hard for me to get/wake up every morning.
20. He could expect his exam to pass
I am not sure what you mean here. Possibly, "He could expect to pass his exam." ?
21. They won't even notice if we just don't say anything.
22. No one uses them as a native language.
If you use the pronoun them here, you are referring to multiple languages. Use the pronoun it to mean a single language. "No one speaks it as a native language."
23. You must be innocent.
24. The team members wanted to win their division.
25. I cannot answer that question offhand.
26. All seats are answered for.
You can also say, "All seats are spoken for."
27. Even though I am sick, I have to go to work.
28. I star in this movie.
29. I was serveral times in german.
I have been to Germany several times.
30. The people criticizing the president of the country
This is not a complete sentence. Change "criticizing" to "criticize" or add the word "are" in front of criticizing to make it a complete thought.
31. He is reliable.
