一、情態(tài)定義

情態(tài)動詞+動詞原形（不處理動詞）
整體是一個謂語動詞训枢。

特點：

• 情態(tài)動詞的時態(tài)變化有限
• 情態(tài)動詞沒有人稱變化

二、情態(tài)使用

• Children may face serious difficulties...
• Today, the virtue of work may be a bit overblown. may be 謂語動詞

maybe 副詞忘巧，修飾動詞/句子恒界，“可能，也許:
Maybe I can show you the way.

三袋坑、情態(tài)動詞的時態(tài)

• 現(xiàn)在
• 過去

過去時含義：

• 表示過去
• 不表示過去仗处，表示現(xiàn)在的更委婉語氣
• 用于虛擬語氣

Can you help me now?
Could you help me now?

四、情態(tài)動詞表示情態(tài)

1.must 必須

• To some extent the housing sector must shoulder the blame.

2.can/could 能夠

• They can also learn geometry by assembling a bicycle.
• In the past, workers with average skills.. could earn an average lifestyle.

3.will/would 愿意/將要

• Will you marry me?
• some will be less effective than others.
• In effect, the approach would create a “walled garden” in cyberspace...

4.may/might 可以/可能

• May I help you?
• guilt may compensate for an emotional deficiency.
• We might then begin to solve our immigration challenges.

5.should 應(yīng)該

• Should they become charitable corporation?
• ...I should have deep work scheduled for roughly the next month.

五枣宫、情態(tài)動詞表示推測

可能性最高：must 肯定 一定
可能性一般：may/might can/could should... 可能 也許
可能性較低：can't couldn't 不可能

• other suits may have an even greater impact.
• Such a move could affect firms such as McDonald's...

推測不同時間：

• 情態(tài)動詞 + do 推測現(xiàn)在
• 情態(tài)動詞 + be doing 推測現(xiàn)在正在進行
• 情態(tài)動詞 + have done 推測過去

eg：

• It must have rained yesterday.昨天肯定下雨了
• She must have cried.
• Jealousy and anger..may have evolved to alert us to important inequalities.
• They may be coming [into the workforce]...

詞組：have to / ought to + do
..Google has to maintain vast data centres around the world...

六婆誓、語態(tài)

• 主動語態(tài)：I eat apples.
• 被動語態(tài)：Apples are eaten.

1.被動語態(tài)構(gòu)成

be+done

• be：被動的時間、主語的單復(fù)數(shù)
• done：被動的動作

eg：
But her appeal was considered a failure...

強調(diào)被誰做：

• The shortage is compounded by federal immigration raids...

2.被動語態(tài)與時態(tài)結(jié)合

但是她的呼吁（過去）被認(rèn)為是失敗的：
But her appeal was considered a failure.

但是她的呼吁（現(xiàn)在）被認(rèn)為是失敗的：
But her appeal is considered a failure.

但是她的呼吁將會（現(xiàn)在的將來）被認(rèn)為是失敗的：
But her appeal will be considered a failure.

但是她的呼吁過去將會（過去的將來）被認(rèn)為是失敗的：
But her appeal would be considered a failure.

但是她的呼吁過去正在被認(rèn)為是失敗的：
But her appeal was being considered a failure.

但是她的呼吁現(xiàn)在正在被認(rèn)為是失敗的：
But her appeal is being considered a failure.

但是她的呼吁過去已經(jīng)（過去的之前）被認(rèn)為是失敗的：
But her appeal had been considered a failure.

但是她的呼吁現(xiàn)在已經(jīng)（現(xiàn)在的之前）被認(rèn)為是失敗的：
But her appeal has been considered a failure.

3.被動語態(tài)與情態(tài)結(jié)合

情態(tài)動詞 + be + done

• Obesity can be divided into moderately obese, severely obese, and very severely obese.
• Their success may be determined by a suit
• sustainability-oriented values must be expressed through everyday action and choice.

七也颤、謂語動詞的否定

1.實義動詞變否定

有實際意義的動詞
did/do/does + not + 動詞原形

• I liked music. I did not like music.
• I like music. I do not like music.
• He like music. He does not like music.

eg:

• A few decades ago, many people didn't drink water outside of a meal.
• We don't need more categories.
• a gap year does not hinder the success of academic pursuits.

2.非實義動詞變否定

直接加not變否定
例如：be動詞洋幻，情態(tài)動詞，完成時態(tài)中的have/has/had等

• Thinner isn't always better.
• Money may not quite buy happiness...
• It has not been much fun.
• I will not be waiting for you.（既有情態(tài)動詞又有be動詞翅娶，not放情態(tài)動詞后面）

八文留、謂語動詞的強調(diào)

do/does/did + 動詞原形

I trust you.
I do trust you. He does trust you.

eg：

• The zone do deliver some improvements to air quality..
• But science does provide us with the best available guide to the future...
• The number of adults doing weekly sport did rise, by nearly 2 million in the run-up to 2012 ...