will这个用法一般语法书上未重点解说，语焉不详，今具体解说如下：
1.will用作情态动词可表示规律性、习惯性、典型性的行为；
Some birds will fly away to the south when the weather turns cold.
天气转冷，有一些鸟飞去南方。
…experts confirmed that a puma will not attack a human being unless it is cornered.
（新概念3，L1）
专家们断定说美洲狮如果不受到围攻是不会伤人的。
There’s no snake known that will habitually attack human beings unless threatened with its life.
除非自己的生命受到了威胁，已知的蛇中还没有习惯性地攻击人类的。
Sometimes the cat will lie there all afternoon.
有时候那只猫整个下午都躺在那儿。
Water will boil at 100℃. 水在100℃时沸腾。
If the pure water is heated to 100℃， it will boil.
如果纯净的水加热至100℃，它就会沸腾。
The thicker the material, the less susceptible the garment will be to wet conditions.
布料越厚实，衣服就越不容易浸湿。
She will sit there for hours.她经常在那儿坐上几个小时。
Only in summer will the ice melt.
只有在夏天，那里的冰才会融化。
Fish will die without water.鱼没有水就会死。
The sun will rise in the east. 太阳会从东方升起。
I will take a walk after dinner every day.
我每天晚饭后都会散步。
When I get on a bus and I see an advert, I will read it.
每当我上了公共汽车，看到广告时，我总是读一读。.
I will work one day and loaf the next.
我上一天班，休息一天。
She will dance for hours.
她一跳舞就跳好几个小时。
They’ll happily spend the whole day playing computer games.
他们会愉快地玩一整天的电脑游戏。
She will wait until the last minute to finish her homework.
她总是等到最后一刻去完成作业。
She WILL fall in love with the wrong people. 她谈恋爱老找错人。
The door won’t open.
这门经常打不开。
She will write for hours at a time. 她经常一写就是几个小时。
She will never listen to me. 她从不听我的话。
Jealousy will spoil friendship.嫉妒会破坏友谊。
Accidents will happen.意外事故是不可避免。
Sometimes he will wander in the hills all afternoon.
有时他会整个下午在山里漫游。
Boys will be boys.男孩终究是男孩。
Art thieves will often hide an important work for years after it has been stolen.
艺术品盗贼偷走重要艺术品后常常把它藏匿好几年。
A second hand car dealer will always look at the bodywork rather than the engine.
旧汽车经营商总是看车身而不看引擎。
She’ll sit talking to herself for hours. 她能坐着自言自语几个小时。
When you look at clouds they will often remind you of animals.
你观察云彩的时候，往往会联想起动物。
If something breaks down and you kick it, it will often start working again.
如果某件东西出了毛病，你踢它一脚，它往往就会好了。
2. 注意:若在will上重音强调，说明这种行为让说话者很恼火，可以翻译为总是，经常，常常
He will always be late for class. 他总是上课迟到。
He’ll talk for hours, if you let him.
如果你让他讲话，他总是要讲几个小时。
People will talk.人总会说闲话。
He will leave his coat on the chair instead of hanging it up.
他总是把外套扔在椅子上，而不是挂起来。
She'll listen to music, alone in her room, for hours.
她总是独自一个人在屋里听音乐，一听就是几个小时。
If you will keep interrupting me, how can I answer your question?
如果你总是打断我，我怎么回答你的问题呢？
She will listen to records， alone in her room for hours. We just won’t interrupt her， for we know this is her usual way to stay in peace.
她常常独自一人在房间里听唱片，一听就好几个小时。
He will comb his hair at the table, even though he knows I don't like it. 他总是在桌子旁梳头。
I will get angry over nothing.
我总会无缘无故的生气。
He will leave his socks lying all over the place and it drives me crazy. 他总是把袜子丢得到处都是，这简直让我发疯。
He will keep intruding.
他总是打扰我们。
He’ll usually show up about a half an hour late with no excuse or apologies.
他通常会迟到半小时左右，没有解释或道歉。
will的过去式would表示过去的习惯性行为
He will often read deep into the night.他会读书到深夜。（现在习惯）
He would often read deep into the night.他会读书到深夜。（过去习惯）
The young man will sit there for hours doing nothing. 那个年轻人常几个小时坐在那儿无所事事。（现在习惯）
The young man would sit there for hours doing nothing. 那个年轻人常几个小时坐在那儿无所事事。（过去习惯）
He would sit by the window, thinking about the past.他过去常常坐在窗边，回忆过去。
He would come to see me when he was free.他有空时常来看我。