帮忙6句英语翻译！

1我给了店员一张一百元的钞票，他多找了我一张五十的（extra)
I gave the shop assistant a bill of 100 Yuan, he gave change to me with an extra 50 bill.
2 我很懊悔伤害了你，但当时我真的不是故意的（mean to）
I regret hurting you, but I didn’t mean to do so at that time.
3 他当时太害怕了，甚至都忘记了报警（contact）
He was so scared that he forgot to contact with the policeman.
4 你的建议听起来合理，但在这一点上我恐怕难以苛同（at this point）
It sounds reasonable of your advice, but I am afraid I can’t agree with you at this point.
5 当时彼得忙着收拾地上的书本，差点被一辆自行车撞到（be busy doing）
Peter was nearly hit by a bike, when he was busy tidying up the books on the ground.
6 别再无休止的抱怨了，这无济于事（do no good）
Stop grumbling any more, it will do the whole thing no good.

1. I pay the salesman 100 yuan/dollar, but he pay an extra 50 back to me.

2. I sorry to hurt you ,but I didn't mean to at that time.

3. He was so scared that he forgot to contact the police.

4. Your suggestion sounds reasonable ,but I&