"This" is the singular form, as in "This injury was self-inflicted." "These" is used with a plural form. "All of these injuries were self inflicted." Note that the verb form also changes.
No, the phrase "of which we are all" is not grammatically correct. It would be better to say "of which we all are" or simply "which we all are."
All the
No, I sould suggest "What do you all expect?"
The correct phrase is "both genders."
You may say: you are adapted to all situations.
No, it is not correct. The correct way to phrase it would be "Thank you to all of you."
No. it is not correct to say that we are all bi sexual.
The term 'no absences' is correct if used in the right context; for example: There are no absences in my class today. If you have no absences for the next week, you will be on the attendance honor roll. Our goal is no absences for on the job injuries.
yes it means that you did not touch anything
No, the correct phrase would be "In compliance with all points above."
Yes, but better to say the sum etc.
yes it is correct but it is informal language; therefore you shouldn't use it in proper language. you can also say "Thursday's okay with me." or you could say "Thursday's fine for me." but all of these are correct in general