turn
单词辨析：
普通用词，可指任何变化，强调与原先的情况有明显的不同。
A witch changed the boy into a mouse.
女巫把那男孩变成了一只老鼠。
The economic situation has changed considerably.
经济形势已发生了相当大的变化。
The leaves on the trees change colour in the autumn.
树叶在秋天改变颜色。
常指轻微改变，强调在保持原状的情况下进行局部改变。
Your coat is too big. You must have it altered.
你的外衣太大了，得找人改一下。
The working condition must be altered to meet the new requirements.
工作环境必须改善，以适应新的要求。
指改变形式、用途、使用方式等，也指改变信仰、观点、态度等。
Please convert this money into RMB.
请把这钱兑换成人民币。
Her mother has converted to Catholicism.
她母亲已改信天主教。
指对某物作细小的改动以对其进行改进，使其更适用或更高效。
The plan must be modified if it is to be used.
这项计划要用就必须修改。
You'd better modify your tone.
你最好说得和缓些才是。
指在形式、外观、性质等方面彻底改变，即成为全新的东西。
The magician transformed the handkerchief into a bird.
魔术师把那条手帕变成了一只鸟。
Solar energy can be transformed into power.
太阳能可以转化为能量。
普通用词，指外形、颜色、气味、性质等方面发生变化。
Coal can be turned into heat.
煤可以转化成热。
He turned this novel into an English best-seller.
他把这本小说变成了英语畅销书。
指根据某一情况的变化而变化，也指更改某事物。
The prices of fish vary according to market conditions.
鱼的价格随着市场行情而变化。
Old people don't like to vary their habits.
老年人不喜欢改变他们的习惯。
相关例句：
Tonight it's my turn to cook
今晚该我做饭了。
He felt too shocked to move. His world had been turned upside down.
他惊呆了。他的世界已经完全被打乱了。
The scandal took a new turn over the weekend.
周末时丑闻有了新的发展。
It was his ambition to accumulate a million dollars before he turned thirty
他立志要在而立之年以前攒够100万美元。
The firm will be able to service debt and still turn a modest profit
那家公司将有能力支付债务，而且还会赚得一笔可观的利润。
His tone was by turns angry and aggrieved.
他的语气时而透着愤怒，时而流露出哀怨。