for有很多種用法：
1.表示“當(dāng)作、作為”.如:
I like some bread and milk for breakfast.我喜歡把面包和牛奶作為早餐.
What will we have for supper?我們晚餐吃什么?
2.表示理由或原因,意為“因?yàn)椤⒂捎凇?如:
Thank you for helping me with my English.謝謝你幫我學(xué)習(xí)英語(yǔ).
Thank you for your last letter.謝謝你上次的來(lái)信.
Thank you for teaching us so well.感謝你如此盡心地教我們.
3.表示動(dòng)作的對(duì)象或接受者,意為“給……”、“對(duì)…… (而言)”.如:
Let me pick it up for you.讓我為你撿起來(lái).
Watching TV too much is bad for your health.看電視太多有害于你的健康.
4.表示時(shí)間、距離,意為“計(jì)、達(dá)”.如:
I usually do the running for an hour in the morning.我早晨通常跑步一小時(shí).
We will stay there for two days.我們將在那里逗留兩天.
5.表示去向、目的,意為“向、往、取、買(mǎi)”等.如:
Let’s go for a walk.我們出去散步吧.
I came here for my schoolbag.我來(lái)這兒取書(shū)包.
I paid twenty yuan for the dictionary.我花了20元買(mǎi)這本詞典.
6.表示所屬關(guān)系或用途,意為“為、適于……的”.如:
It’s time for school.到上學(xué)的時(shí)間了.
Here is a letter for you.這兒有你的一封信.
7.表示“支持、贊成”.如:
Are you for this plan or against it?你是支持還是反對(duì)這個(gè)計(jì)劃?
8.用于一些固定搭配中.如:
Who are you waiting for?你在等誰(shuí)?
For example,Mr Green is a kind teacher.比如,格林先生是一位心地善良的老師.
而
The computation of torque for ideal and practical currents is developed中的for是用來(lái)連接torque和ideal的