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助動詞的實用方法
協助主要動詞 構成謂語的詞叫助動詞(Auxiliary Verb)，也叫輔助動詞。被協助的動詞稱作主要動詞(Main Verb)。以下是小編整理的關于助動詞的實用方法，希望大家認真閱讀!
1助動詞be
一般疑問句：
陳述句變為一般疑問句時,如句中有be動詞(am/is/are/ was/were),可直接將它們提至主語前。
如主語為第一人稱,應將其改為第二人稱。例如：
I'm watching TV.
Are you watching TV?
如主語為第三人稱，那么單數用is，復數用are。
例如：
He is good at swimming
Is he good at swimming?
My classmates are kind and polite.
Are your classmates kind and polite?
時態為一般過去時，例如：
He was an engineer.
Was he an engineer?
They were on a long journey.
Were they on a long journey?
特殊疑問句：
特殊疑問句有兩種語序：
如疑問詞作主語或主語的定語，即對主語或主語的定語提問，其語序是：
“特殊疑問詞+陳述句”，例如：
Alice is singing in the room.
Who is singing in the room?
如疑問詞作其他成分，即對其他成分提問，其語序是：
“特殊疑問詞+一般疑問句”，例如:
He is from Canada.
Is he from Canada?
Where is he from?
2助動詞do
一般疑問句：
陳述句變為一般疑問句時,如句中只有一個實義動詞作謂語時，句首加do或does，主語后的實義動詞用原形。
例句：
I want to have a haircut.
Do you want to have a haircut?
She like that red car.
Does she like that red car?
時態為一時般過去時，則在句首加did，主語后的實義動詞用原形。
例句：
She came by train.
Did she come by train?
特殊疑問句：
特殊疑問詞+一般疑問句，例如:
He plays basketball every night.
Does he play basketball every night?
What does he do every night?
3助動詞have
一般疑問句：
在現在完成時中，陳述句變為一般疑問句則需將has/have提前，放在句首。
例句：
I have finished my homework.
Have you finished your homework?
He has changed his mind.
Has he changed his mind?
特殊疑問句：
特殊疑問詞+陳述句，例如：
He has cleaned the room yesterday.
Who has cleaned the room yesterday?
特殊疑問詞+一般疑問句，例如：
I have studied English for three years.
Have you studied English for three years?
How long have you studied English?
4助動詞shall和will
注意：Shall只用于第一人稱，如用于第二、三人稱，就失去助動詞的意義，變為情態動詞，且有命令意味。
變為一般疑問句，只需將shall和will提前至句首。例如：
We should study harder at English.
Should we study harder at English?
He will go to Shanghai.
Will he go to Shanghai?
變為特殊疑問句，例句：
I shall look after the sheep.
Who shall look after the sheep?
She will go to Beijing tomorrow.
When will she go to Beijing?
5助動詞should和would
should無詞義，只是shall的過去形式，只用于第一人稱;
would也無詞義，是will的過去形式。
用法與shall，will相似，只是shall，will表示一般將來時，should，would表示過去將來時。
注意：這里的shall,will,would,should只作助動詞使用，無詞義，而非情態動詞。
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