Must与Have To有细微的差别
Modal verbs in English serve to indicate possibility,obligation and more.The most common examples of modal verbs include can,may,must,will and shall.Must is the one indicating an obligation or a necessity to do something.
英语中的情态动词用来说明可能性，义务或者其他。最常见的情态动词包括can,may,must,will和shall。Must是用来说明义务以及做某事的必要性。
I must wake up early to catch a morning train.
我必须早点起来去赶早车。
However,we could also say:
然而，我们也可以说：
I have to wake up early to catch a morning train.
我不得不早点起来去赶早车。
语法上来说，他们都对，但是有什么细微的区别吗？有！
The difference between must and have to is subtle.Both refer to an obligation,but must indicates an opinion or suggestion.Have to is an expression of a more objective obligation coming from an outside force.
Must与have to之间的差别是细微的。两者都指义务，但是must是指意见或者建议。Have to指来自于外部世界的客观义务。
因此说某个人必须做她的家庭作业是你的意见。说她不得不做她的家庭作业代表着她必须这样做。在非正式的场合must和have to不可互换。在正式一点的场合，熟知must和have to的区别你就可以把它们区分开。
I和Me是不可互换的
I and me are’t interchangeable.They are used in different grammatical constructions.I is a pronoun that serves as a subject of a sentence.For example,Matthew and I went for a walk,both I and Matthew are subjects of the sentence while went is the verb.Me is a pronoun that serves as an object of a sentence.Me is needed when someone else is performing the action.
I和Me是不可互换的,它们用于不同的语法结构。I是一个代词，是一个句子里的主语。例如：马修和我出去散步，这里I和Matthew都是句子里的主语，而went是一个谓语动词。Me是一个代词，作为句子里的宾语。当其他人需要执行某个动作时就需要使用me。
To use the example above:Matthew took me for a walk.Matthew is the subject and me is the object in the sentence.Knowing your subjects and objects will help you use these types of pronouns flawlessly!
使用上面的例子：马修和我一起出去散步。Matthew是句子里的主语，me是句子里的宾语。明确你的主语和宾语会帮助你无误地使用这些介词。
小心使用Your和You’re
This is probably the most common mistake on the internet today!Your and you’re sound absolutely the same,but they have very different meanings and uses.
这可能是今天网络上最常见的错误！Your和You’re的读音听起来完全一样，但是它们的意义和用法完全不同。
Your is a possessive determiner that attributes something to you:
Your是一个物主限定词，用来限定属于你的东西。
Your work is impressive!
你的*简直令人钦佩！
You’re is a contraction of you are:
You’re是you are的缩写。
You’re a very successful writer.(You are a very successful writer.)
你是一个非常成功的作家。（你是一个非常成功的作家。）
Mistakes happen when possessive pronouns are confused with verb contractions,even among native English speakers.Often,you may see phrases like your wrong(instead of you’re wrong),you’re sister(instead of your sister),etc.These are grammatical errors.They’re easy to avoid.Don’t repeat them!
