already與yet的區別
導語：already與yet同用于完成時態，表示已經的意思，那么應該如何區分呢？讓我們了解一下吧！
Already and Yet - Used with the Present Perfect
already和yet——用于現在完成時態
Both already and yet refer activities around the present moment in time.
二者指的都是現在某個活動。
I have already finished my lunch.
我已經吃完午飯了。
Have you seen Tom yet?
你看到湯姆了嗎？
They haven't visited Rome yet.
他們沒有去羅馬。
Already - Referring To a Past Event
指過去的事件
Already is used to something that happened before the moment of speaking. However, it refers to something that affects the present moment in time. Let's take a look at a few examples:
already用來指發生于說話之前的事件。但是，它指代的是對現在產生影響的事件。下面我們看看幾個例子;
I have already finished the report.
我已經完成報告了。
This sentence could be used to express the idea that I finished the report and it is ready to read now.
該句話可以用來表示，我完成了報告，現在可以看了。
She has already seen that film.
她已經看過那個電影了。
This sentence might express that the woman saw the film in the past, so she has no desire in the present moment to see the film.
該句話可以用來表示，這位女士之前看過這場電影，所以她現在不想再看了。
They have already eaten.
他們已經吃完了。
This sentence would probably be used to state that they are no longer hungry in the present moment.
該句話可以用來表示，他們現在不餓了的意思。
The key to using 'already' is to remember that an action that has happened in the past - often in the recent past - affects the present moment or a decision about the present moment in time and therefore is used with the present perfect tense.
already用法的關鍵所在就是，記住這個動作是發生在過去——通常是最近——對現在或現在的決定產生影響，因此要用現在完成時態。
Already - Sentence Placement
句中的位置
Already is placed between the auxiliary verb 'have' and the participle form of the verb. It is used in the positive form and should not be used in the negative.
Already位于助動詞have和動詞的分詞形式之間。它用于主動語態，而非被動語態。
Subject + have / has + already + past participle + objects
主語+have/has+already+過去分詞+賓語
I have already seen that film.
我已經看過這個電影了。
Mary has already been to Seattle.
瑪麗已經去過西雅圖了。
NOT!!
錯誤用法：
I have seen already that film.
我已經看過這個電影了。
Already is generally not used in the question form. However, when expressing surprise in a rhetorical question it is sometimes used in informal conversations.
already一般不用于疑問句中。但是，當以反問的形式表達驚訝時，already可以用于一些非正式對話中。
Have you already eaten?!
你已經吃完了？！
Have you already finished?!
你已經完成了？！
Yet - Asking Questions
用于疑問句中
Yet is used to check whether something has occurred up to the present moment.
yet用于確認某事目前有沒有發生。
Have you seen that film yet?
你看過那個電影嗎？
Has Tim done his homework yet?
蒂姆做完作業了嗎？
You may notice that there is a similarity to the use of 'ever' in the present perfect to ask a question:
你可能會注意到，這種用法與現在完成時態中關于ever的疑問句類似：
Have you ever seen that film?
你看過那個電影嗎？
Have you seen that film yet?
你看過那個電影嗎？
These questions are very similar in meaning, but yet is generally used to ask about something closer to the present moment. Yet is often used when someone expects something to have occurred recently.
這些問句在意義上十分相似，但是yet一般用于詢問不久前發生的某件事。Yet常用于某人期望最近發生某事。
Have you finished that report yet? - In this case a colleague expects the report to be finished soon.
你完成報告了嗎？——在這種情況下，同事是希望報告可以很快完成的。
NOT
錯誤用法：
Have you ever finished that repot? - Ever is used to ask about experience in general, not whether something specific has been completed recently.
你完成報告了嗎？——ever一般用來詢問是否經歷某事，而不是具體的某件事最近是否完成了。
Yet - Question Placement
句中的位置
Yet is always placed at the end of a question. Notice that yet is not used with question words as questions with yet are yes/no questions.
yet常位于疑問句的末尾。注意：yet不會和疑問詞搭配在一起，因為帶有yet的疑問句都是關于是/否的句子。
Have + subject + past participle + objects + yet + ?
have+主語+過去分詞+賓語+yet+？
Examples:
例子：
Have you finished that report yet?
你完成報告了嗎？
Has she bought a new car yet?
她買了新車了嗎？
Yet - Negative Form
用于否定句中
Yet is also used in the negative to express that something that is expected has not yet happened. In this case, yet is placed at the end of the sentence.
yet也可以用于否定句，用來表示期望某事不要發生。在這種情況下，yet位于句末。
Subject + have not / has not + past participle + objects + yet
主語+have not/has not+過去分詞+賓語+yet
She hasn't finished the report yet.
她沒有完成報告。
Doug and Tom haven't telephoned yet.
道格和湯姆沒有通電話。
Already - With the Past Perfect
用于過去完成時
Already can also be used with the past perfect to express that something had happened before something else. It is used in the same senses explained previously with present perfect usage.
already也可以用于過去完成時，用來表達某事發生于另一事件之前。在之前現在完成時的句子中，也可以使用already。
She had already eaten when he arrived.
當他到達時，她已經吃完了。
Jackson had already done his homework when he was asked for help.
當他求助時，杰克遜已經完成作業了。
Already - With the Future Perfect
用于將來完成時
Already is also used with the future perfect to express that something will have been completed before something else occurs.
already也可以用于將來完成時，用來表達某事在另一事之前發生。
She will have already finished the paperwork before the meeting.
她在會議之前就可以完成文書工作。
Frank will have already prepared the report by the time the boss asks for it.
在老板問起之前，法蘭克就會準備好報告。
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