Could you please check the grammar in the following sentences? Thank you very much in advance.

1.I had just turned off the light to go to sleep and I was dozing off when I felt/experienced the greatest fear in my life
2.He had tried to get in touch with Sam when he arrived in Edinburgh but he had moved
3.They should have informed you that the meeting would be at 12 am instead of (and not?) at 11 am
4.She could have been with Mark the night of the murder.
5.If I could talk to a reporter, I would tell him about the industrial revolution
6.If Clive hadn’t helped me with the translation, I would have never finished it
7.They could have got lost but they managed to find the right way at the end

1. A comma is needed between the two independent clauses.

2. A comma is needed between the two independent clauses.

3. OK. Either word choice works.

4. OK.

5. OK

6. OK

7. A comma is needed between the two independent clauses. Also the verb should be "gotten."

Sure! Here are the grammar corrections for the sentences you provided:

1. "I had just turned off the light to go to sleep, and I was dozing off when I felt/experienced the greatest fear of my life."
- In this sentence, it is more commonly used to say "the greatest fear of my life" instead of "in my life". The use of the conjunction "and" in this case is preferred over "when" to help connect the two actions happening simultaneously.

2. "He had tried to get in touch with Sam when he arrived in Edinburgh, but he had moved."
- This sentence is grammatically correct. No changes are necessary.

3. "They should have informed you that the meeting would be at 12 pm instead of 11 am."
- The correction is changing "12 am" to "12 pm" as "am" stands for "ante meridiem" (before noon) and "pm" stands for "post meridiem" (after noon). Additionally, it is preferred to use "instead of" rather than "and not" to clarify the change.

4. "She could have been with Mark the night of the murder."
- This sentence is grammatically correct. No changes are necessary.

5. "If I could talk to a reporter, I would tell him about the Industrial Revolution."
- The corrected sentence correctly capitalizes "Industrial" as it is a proper noun. Additionally, the use of "would tell" is recommended to maintain consistency in the conditional sentence structure.

6. "If Clive hadn’t helped me with the translation, I would have never finished it."
- This sentence is grammatically correct. No changes are necessary.

7. "They could have gotten lost, but they managed to find the right way in the end."
- The corrected sentence includes the verb form "gotten" (past participle of "get") to maintain consistency. Additionally, using "in the end" instead of "at the end" is more commonly used to indicate the conclusion of an event.

I hope this helps! Let me know if you have any further questions.