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Can someone help me with these? Thank you.

1 We’re going to play (until) late/into the early hours of the morning. Until is optional 2nd OK

2 I can hurt you just as I can be nice to you. Its your choice. OK

3 I was able to do it with a little will(power). WILL no POWER
4 Not for the world would he have…/For nothing in this world would he have created anything. Nothingness not only suited him, it satisfied him. I don’t know
5 The crime was carried out with premeditation. I don’t know

6 There is a broker training program in London where they can simulate/replicate a day’s market activity so broker can train to become real ones. I don’t know if it’s MARKET ACTIVITY and don’t know if sentence is OK?

7 When you take your watch out of pawn shop, you have to wait 10 days to/before pawning it again.

8 The use you have for the computer, this computer is more than enough./For what you do with it, this is enough. Don’t know

9 What difference would it have made had I slept over./ What would you have cared if I slept there

10 I hope you didn’t do what I think you did.
11 When a car leaves the dealership it loses 20 percent of its price/value right away.

12 How fast were you going in relation to the cars (by bike)

13 Its not like it takes up a lot of room, just leave it there.

14 For once that I want to play, you don’t want to.

How much government aid do you get on 1000 dollar rent. Don’t know

Thanks
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1 We're going to play (until) late/into the early hours of the morning.
2 I can hurt you or I can be nice to you. It's your choice.
3 I was able to do it with a little willpower.

4 Not for the world would he have.../For nothing in this world would he have created anything.

5 The crime was premeditated.
6 There is a broker training program in London where they can simulate/replicate a day's market activity.
7 When you take your watch out of a pawnshop, you have to wait 10 days before pawning it again.
8 For the use you have for the computer, this computer is more than enough./ For what you do with it, this is enough.
9 What difference would it have made had I slept over?/ What would you have cared if I had slept there?
10 I hope you didn't do what I think you did.
11 When a car leaves the dealership, it loses 20 percent of its value right away.
12 How fast were you going in relation to the cars?
13 It's not like it takes up a lot of room; just leave it there.
14 For once I want to play, and you don't want to.
How much government aid do you get for your 1000-dollar rent?
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thank you Mister micawber. I had just one question about 3. Whats the difference between will and willpower, why is it not WILL.
and is it : What would you have cared if I had slept there? or What do you care if I had slept there. Is the first the past form of the 2nd sentence?
thanks
3-- 'Will' is not used in that way, that's all I can say, while 'willpower' is common there. And then there are idioms, e.g. 'work with a will'.

9-- Not the past form; that would be 'What did you care'. It is a past conditional, primarily expressing more politeness.
one last thing : What would you have cared if...

Is that how would you say it, or does it not sound natural, how would you?
thank you
Students: We have free audio pronunciation exercises.
That part is OK.