Could you please comment on the correctness of the sentences below:
1) This is the first time in history that an official presidential portrait was taken with a digital camera.
2) This is the first time she shared it publicly.
3) This is the first time you are working a game for her/his team.
4) ...that in 20 years of going to this church, this is the first time he realized that these kind of things were going on...
5) This is the first time that I have heard her sing.
- For Teachers