be sure后面加什么

"be sure"后面通常可以加名词、代词或不定式，表示确保、确定或确信某事。以下是一些例子：1. Be sure to lock the door when you leave.（离开时确保锁门。）2. I'm not sure if he will come to the party.（我不确定他是否会来参加派对。）3. Be sure of your facts before you make a decision.（在做出决定之前，确保了解事实。）4. She was sure that he was telling the truth.（她确信他在说真话。）5. Make sure you understand the instructions.（确保你理解了指示。）总结："be sure"后面可以加名词、代词或不定式，表示确保、确定或确信某事。使用时要注意语法结构和语境。

'Be sure' is a versatile phrase in the English language that can be used in various contexts to express certainty, intention, or a condition. It can be followed by a noun, a verb, or a clause, each carrying a distinct meaning. Here's a breakdown of its common usages:

1. Be Sure of Something

When you are 'be sure of something', you are expressing confidence in the truth or existence of that thing. It reflects a high degree of certainty.

For example: "He might get there in time, but I can't be sure."

This sentence conveys that while there's a possibility of him arriving on time, the speaker is not certain about it.

2. Be Sure to Do Something

The phrase 'be sure to do something' is used to emphasize the necessity or intention to perform a particular action. It's a directive that carries a sense of obligation or importance.

For example: "Be sure to give your family my regards."

This instruction implies that it's important to remember to convey the speaker's greetings to the listener's family.

3. Be Sure That

When 'be sure' is followed by 'that', it introduces a clause that the speaker is certain about. This construction is often used to express a condition or a fact that the speaker is confident in.

For example: "Even if you did see someone, you can't be sure it was him."

This statement suggests that while there might have been a sighting, the certainty of the person's identity is not guaranteed.

4. Be Sure in a Conditional Context

'Be sure' can also be used in conditional sentences to indicate that a particular outcome is necessary for a desired result to occur.

For example: "England must win this game to be sure of qualifying."

Here, winning the game is presented as a prerequisite for the team to ensure their qualification.

5. Be Sure as an Adjective

Sometimes, 'be sure' is used as an adjective to describe a quality or characteristic that is undoubtedly present.

For example: "He is intelligent, to be sure, but he's also very lazy."

This statement acknowledges the person's intelligence while also pointing out another trait, laziness, that is equally certain.

Understanding the different ways 'be sure' can be used will enhance your ability to express certainty, intention, and conditions in English more effectively.