Do you need the overtime work? If you don't and you don't like it, then just try and stick with the normal hours. However, if you need it: Try to find better work but stay with the overtime UNLESS you are feeling unwell. If you feel unwell, STOP doing overtime. Overtime can kill, seriously.

My homework)

You've BEEN looking at that timetable for the last ten minutes.
I DO wish you'd be quiet!
You're both A very silly.
THERE is no point, at all, in blaming each other.
You ARE quite.  quiet.
I AM sorry.
This is the worst holiday we've EVER been on.
Sasha DON'T DOESN'T LIKE team sports at all.
I HAVE BEEN WRITTING this (for) hours and it's still not right.
It's the first time WHEN I'M FLYING alone.
Poul DOES ENJOY surprises, just not on his birthday.
Phil does not looks not old enough to drive a car.
I'm thinking (I would use - I think) I'm going to buy the new Racetrack CD.
Clair is having/getting a haircut at the moment.
Help me, please, inspect it)

VERSION 1 WITH NOTES:

I just write wrote (wrote is used be cause you are not commanding someone to "write" a letter, you have already written the letter, therefore you use "wrote") a (you use "an" in front of a word beginning with a vowel : a e i o u) an English mail (mail is a plural word [2+] and is used to mean letters/parcels or it is used when you send something: e.g. Please mail the parcel to John tomorrow) letter.This Does ("does" is used at the beginning of a sentence to make it a question) this sentence make sense?

Hello there, (a comma (,) is usually in the beginning of a letter)

we just confirmed your reservation booking number: 876687610. 

Now your reservations is are (reservations is a plural word so you must use "are", if the word is single, you can then use "is") all confirmed. 

To confirm, (the comma is used because

you have ("have" seems appropriate, you can decide whether or not you want to use it) booked two rooms: (colon (:) may be used to introduce a list, which is, in this case, the list of rooms that were booked) 

The first room is a ("a" is used in front of a noun "room" but if there are more than one, then "are" would be used in front of the noun e.g. the first rooms are family rooms) family room for 4 people (Twin Beds as there would be two beds required in order for the 4 people to fit in one room).

The second room is a Studio room for 2 people (Double Bed). 

The period of the reservation is from 2012.10.1.~2012.10.6 

and the rooms are [just next door to the...(place) or right next to each other]

Is that right? (it would be more professional to use "Are the details stated above, correct?")

Thanks. (Thank you)

If you have need any help (or you can use "If you have any trouble, please email me), please E-mail me.

VERSION 2 WITHOUT NOTES:

I just write wrote an English letter.Does this sentence make sense?

Hello there, 

we just confirmed your reservation booking number: 876687610. 

Now your reservations are all confirmed. 

To confirm, 

you have booked two rooms:

The first room is a family room for 4 people (2 Twin Beds).

The second room is a Studio room for 2 people (Double Bed). 

The period of the reservation is from 2012.10.1-2012.10.6 

and the rooms are right next to each other.

Are the details stated above, correct?

Thank you very much.

If you need any help, please E-mail me.