We can get there on time tomorrow.
We can go there on time tomorrow.
May I know your name?
May I know your name?
Can we start now?
Shall we start now?
You must abide by the school rules.
You must abide by the school rules.
Modal verbs are few in number, but widely used, mainly as follows:
Yes, maybe, must, need, should, dare, should, willing.
Location of modal verbs:
Modal verbs come before predicate verbs in sentences. If there is an auxiliary verb before the predicate verb, it is before the auxiliary verb. In interrogative sentences, modal verbs precede the subject.
I can see you. Come here.
I can see you. Come here.
He must have left.
He must have left.
what can I do for you?
What do you want?
How dare you treat us like this!
How could you treat us like that!
Characteristics of modal verbs:
Modal verbs are not named, and the number changes. The verb after the modal verb needs to be the prototype, and the negative form is to add "not" after the modal verb. There are two forms of individual modal verbs: present tense and past tense. The past tense is used to express a polite and euphemistic tone, which is not nervous and can be used in the past, present or future.
He may arrive soon.
He will come soon.
We can't carry this heavy box.
We can't move this box.
Sorry, I can't help you.
Sorry, I can't help you.
Usage of modal verbs:
Can (could) means that the speaker can, can, agree, allow, and
If objective conditions permit, could is the past tense of can.
Can you pass me the book?
Can you pass me the book?
Can you help me?
Excuse me, can you help me?
What can you do?
What can you do?
Are you sure?
Are you sure?
Can and could can only be used in the present tense and past tense, and the future tense is represented by can to.
He can totally help us.
He can totally help us.
With the help of my teacher, I will be able to speak English correctly.
Thanks to the teacher's help, I will be able to speak English accurately.
May can indicate that the speaker agrees, allows or asks the other party for permission.
You can take this book home.
You can take this book home.
may I come in?
may I come in?
May I use your dictionary?
May I use your dictionary?
You can put on more clothes.
You can put on more clothes.
He said that he might lend us some money.
He said he could lend us some money.
The negative form of may is may not, and the abbreviated form is mayn't
May is the past tense of May, which can be used in two ways, one is the past tense, and the other is the subjunctive mood, which makes the tone more euphemistic, polite or suspicious.
He told me that he might be here on time.
He said he could come on time.
Can I borrow some money now?
Can I borrow some money?
He may still be alive.
He may still be alive.
Must, should, must, must mean that the speaker thinks it necessary to do something, order, ask others to do something, and speculate on things.
Must is used to refer to the general present tense and the general future tense, and the past tense can be replaced by the past tense of have to.
I must finish my work today.
I must finish my work today.
You shouldn't work all the time.
You can't always work.
Must I return the book tomorrow?
Must I return the book tomorrow?
You must be tired after such a long walk.
You must be very sleepy after such a long walk.
He must be the man I am looking for.
He must be the man I am looking for.
He must go because someone is calling him.
It was him that day.
He left that day because someone called him.
Must+have+ past participle, indicating the present speculation about the past.
He must have told my parents about it.
He must have told my parents about it.
He must have received my letter by now.
He must have received my letter by now.
It's already six o'clock. We must be late again.
It is already six o'clock. We must be late again.
The difference between "must" and "have to": it must represent the speaker's subjective thoughts and have to represent the objective needs.
You must do it now.
You must do it now. (The speaker thinks it must be done now)
I have to go now.
I have to go. (objective conditions must go now)
Need needs to be used in negative sentences or questions.
Do I need to attend the meeting tomorrow?
Do I need to attend the meeting tomorrow?
You don't have to hand in your paper this week.
You don't have to hand in your paper this week.
Need is a modal verb, and its usage is exactly the same as other modal verbs, but need can also be used as a notional verb. At this time, need, like other verbs, has the characteristics of the third person, singular and plural, followed by a verb with to.
I need a bike to go to school.
I need a bike to go to school.
Do you need a dictionary?
Do you need a dictionary?
She needs a necklace.
She needs a necklace.
Needless+have+ past participle means that you did something unnecessary in the past.
You need not have taken it seriously.
You don't have to take it too seriously.
Dare is often used in negative sentences or interrogative sentences.
The little girl is afraid to speak in public.
The little girl is afraid of talking in public.
Dare you catch this kitten?
Dare you catch a kitten?
In addition to being used as a modal verb, "dare" is more used as a notional verb. Usage is the same as that of notional verbs, so we should consider person, singular and plural, tense and so on.
Dare you walk in the dark?
Dare you walk in the dark?
He was afraid to tell the teacher what happened that day.
He was afraid to tell the teacher what happened that day.
Ought should, should be followed by the infinitive with to.
If you want to know how to repair cars, you should read these books.
If you want to know how to repair cars, you should read these books.
You should bring the children here.
You should take the children.
The sentence pattern of "should+should do" refers to past actions, indicating that one thing should be done but not done.
You should have been here yesterday.
You should have come yesterday.
Sentence patterns that you shouldn't do it means that what you shouldn't do has been done.
You shouldn't take books out of the reading room.
You shouldn't take books out of the reading room.
Determination, desire. Would is will's past tense,
Can be used on everyone.
I will try my best to catch up with them.
I will try my best to catch up with them.
I'll never do it again. This is the last time.
I won't do that again, this is the last time.
He said he would help me.
He said he would help me.
Will be used in interrogative sentences, indicating that the speaker makes a request or inquiry to the other party. Wilby will is smoother and more polite.
It's very hot. Can you open the window?
It's too hot. Can you open the window?
Can you help me solve this problem?
Can you help me solve this problem?
would you like some coffee ?
How about some coffee for you?
It means ordering, warning, promising, pleading, suggesting and implying surprise.
You should hand in your exercise books.
You should hand in your exercise book.
This should be no problem.
This should be no problem.
Shall we go now?
Shall we go now?
Why should I see him?
Why should I see him?
Have to, have to, have to, means that objective conditions can only be like this, but must mean that subjective thoughts must be like this.
I have to go now.
I have to go now.
I have to cook for my children.
I have to cook for the children.
You must be here on time next time.
You must come on time next time.
We must get the timetable ourselves.
We must get the timetable ourselves.
References:
www.cnread.net/cnread 1/yyxx/yyyf/008.htm