"since Friday"

[Hanifasmm]

Hi,
1. The patient is unconscious since Friday.
2. The patient was unconscious since Friday.
3. The patient has been unconscious since Friday.
4. The patient had been unconscious since Friday.
Out of the four sentences, which is correct?
Please enlighten me with its grammar involved.
Thanks,
Er.S.M.M.Hanifa

[Beeesneees]

1. / 2. incorrect
"The patient is unconscious now." is correct, but the phrase 'since Friday' means a change of tense is required to take account of the period in the past.
Similarly, "The patient was unconscious on Friday." is correct, but 'since Friday' here requires a change of tense to take account of the period between Friday and now.

3. / 4. are the correct versions of 1. and 2.
Use 3. - if he is still unconscious.
Use 4. - if he is no longer unconscious.
_________________
Cheers m' dears!

[Hanifasmm]

Mr. Beeesneees,
Can I use the following:
It’s over a year since I have met him.
It’s over a year since I met him.
Are they O.K. with their time frame?
Please guide me.
Thanks,
Er.S.M.M.Hanifa

[Beeesneees]

It's over a year since I have met him... I still haven't met him since that point.
It's over a year since I met him - it is possible that I have recently met him again or am about to meet him again. This is the most common of the two.
_________________
Cheers m' dears!