The verbs "let" and "allow" are part of a group of verbs called "causatives."
动词“let”和“allow”是被称为“使役动词”的动词组中的一部分。
These verbs express how one person or thing causes something else to happen.
这些动词表达一个人或物体如何导致其他事情发生。
Making causatives 构成使役句
We will look at each verb. But let's begin by talking a little bit more about causatives.
我们遍览所有动词。但首先，让我们更详细地讨论一下使役动词。
In a causative sentence, the subject does not perform the action of the main verb.
在使役句中，主语不执行主动动词的动作。
Instead, the subject (a person or thing) causes the action to happen to the object (another person or thing).
相反，主语(一个人或物体) 生 语
一个人或物体)身上。
Causative sentences start with a subject, followed by a causative verb, then an object and then the main verb.
使役句以主语开头，接着是使役动词，然后是宾语，最后是主动动词。
Think of it as X causing Yto do something.
可以将其视为X导致Y做某事。
How to use Let 如何使用“let”
Okay, now let's talk about "let". It is more informal.
好的，现在让我们来谈谈“let”。它比较没那么正式。
Make a note of which sentences are about possibility and which are about permission. Here are the examples:
请注意哪些句子涉及可能性，哪些涉及许可。以下是例子:
·I let my children go to the game every week.
我每周让孩子们去看比赛。
·The warm days let us enjoy the end of summer.
温暖的日子让我们享受着夏末。
Let the vegetables cook for about 20 minutes.
·蔬菜要煮约20分钟。
How to use Allow 如何使用“allow”
Now, let's look at "allow". It is more formal than "let". You can use it in everyday situations.
现在，让我们看看“allow”。它比“let”更正式，可以在日常场合使用。
You may also find it in official rules, such as street, building and office signs.
你也可能在官方规定中找到它，例如街道、建筑和办公室标牌。
With "allow," we use the infinitive form for main verbs. The infinitive form is "to" plus the simple form of the verb.
使用“allow”时，我们使用动词的不定式形式。不定式形式是“to”加上动词的简单形式。
For example: 例如:
·My teaching skills allow me to help English learners.
我的教学技能使我能够帮助英语学习者。
·Her parents do not allow her to eat beef.
她的父母不允许她吃牛肉。
·They do not allow us to smoke in the building.
他们不允许我们在建筑物内吸烟。
You may have noted that two examples are in the negative form.
你可能已经注意到两个例子是否定形式。
When talking about rules, we often use"allow" in the negative to say what people must not do.
在谈论规定时，我们经常使用否定的“allow”来说明人们不能做什么。
The passive form 被动语态
Now, let's take a quick break to talk about the passive form, an important form for these verbs.
现在，我们稍作停顿，谈一下被动语态，这是这些动词中一个重要的形式。
The verbs "allow" and "permit" are often used in passive sentences.
“allow”和“permit”经常用于被动句子中。
In a passive sentence, the subject is acted upon, or receives the action of the verb.
在被动句中，主语是被动的，或者是动词的承受者。
The subject is often not mentioned in the sentence.
通常在句子中不提及主语。
When we speak or write about official rules, we often use passive voice.
当我们谈论官方规定时，我们经常使用被动语态。
For example: 比如:
.Smoking is not allowed in the building.
在建筑物内禁止吸烟。
The person or people who made the rule are not mentioned because it is not relevant to the statement.
制定规则的人或人群没有提及，因为这对陈述来说并不相关。
以上内容来源六分钟英语
图片来源网络侵删