不然

Don't bear hard on the pencil, it will break.

别使劲压铅笔, 会断。

Make haste, or (else) you'll be late.

快点, 就来及。

Put on your overcoat, or you will catch cold.

穿上你的大衣，你会着凉。

You must have been going at a rate of knots to have finished so soon.

你肯干得飞快，会这么早就完成。

Lace your boots firmly or the lace will come undone.

把你的靴子系紧, 鞋带会松开。

Make haste, or we shall miss the train.

快一点, 我们就赶上火车。

He reminded me of what I should otherwise have forgotten.

亏他提醒我, 我就忘。

Don’t try it on with me, pal, or you’ll be sorry.

伙计，别跟我来这一套，你会后悔的。

He must be teasing,or else he’s mad.

他一是在开玩笑,他就是疯。

Don’t go too far afield or you’ll get lost.

别走得太远, 你会迷路的。

Darling, go now, or you will be late.

亲爱的，现在走吧，你就会迟到。

Bill had to support Jill or she would have fallen to the floor.

只得扶住吉, 她就会摔倒在地。

Use words, not violence, or you’ll just be sinking to their level.

动口，动手，你也堕落到跟他们没什么两样。

You must study harder (or) else you'll fail in the English examination.

你必须努力学习, 的话, 英语考试会及格的。

Prices seem to have stopped rising in the shops, or is that just wishful thinking on my part?

商店里东西的价格好像再上涨，就是我的一廂情愿？

Jim is irritated enough now; don't blow the coals too much or we shall have an explosion of anger from him.

吉姆现在已经够恼火的, 再给他火上加油, 的话, 他会对我们大发脾气的。

Your toenails are very long,you ought to cut them before they start growing in,or you could be in a lot of pain.

你的脚趾甲太长,应该剪掉,趾甲会往里长,给你造成很大的痛苦。

At others I would find him on the campstool, sitting in his gray sleeping suit and with his cropped dark hair like a patient, unmoved convict.

我便见他坐在折凳上，穿着灰色的睡衣，一头黑发剪得短短的，活象一个耐性挺好、动情的囚犯。

Don’t mention the Internet in front of him, or he’ll get on his soapbox and we’ll be here all night listening to his opinions about the evils of modern technology.

在他面前提因特网，他会慷慨陈辞，那我们整晚都在这儿听他发表关于现代技术的种种罪恶的高论。