First, the general present tense:
1. concept: frequently repeated actions or behaviors and a certain situation now.
2. adverbial of time: always, naturally, often, sometimes, every week (day, year, month …), once a week, Sunday,
3. Basic structure: the prototype of the verb (if the subject is singular in the third person, add (e)S after the verb)
4. Negative form: am/is/are+not; If the predicate verb in this state is an action verb, add don before it. If the subject is singular in the third person, use not and restore the action verb.
5. General interrogative sentence: put the be verb at the beginning of the sentence; Ask questions with the auxiliary verb do. If the subject of the third person is singular, use does. Restore action verbs at the same time.
6. Example:. It seldom snows here.
He is always ready to help others.
Actions speak louder than words.
Second, the general past tense:
1. Concept: an action or state that occurred at a certain time in the past; Habitual and regular actions and behaviors in the past.
2. adverbial of time: before, yesterday, the day before yesterday, last week (year, night, month …), at 1989, just now, 5 years old, one day, a long time ago, at a certain time, and so on.
3. Basic structure: be verb; Action verb
4. Negative form: was/were+not; Add did before the action verb and restore the action verb at the same time.
5. General interrogative sentence: was or are put at the beginning of the sentence; Ask questions with the past tense did of the auxiliary verb do and restore the action verb at the same time.
She often helps us these days.
I didn't know you were so busy.
Third, the present continuous tense:
1. Concept: indicates the actions and behaviors that are going on at the present stage or when speaking.
2. adverbial of time: now, now, these days, etc.
3. Basic structure: am/is/are+do
4. Negative form: am/is/are+not+do.
5. General interrogative sentence: put the be verb at the beginning of the sentence.
6. Example: How do you feel today?
He is good at his lessons.
Fourth, the past continuous tense:
1. Concept: indicates the behavior or action that is happening or going on at a certain time or moment in the past.
2. Adverbial of time: yesterday at this time, at that time or when the leading predicate verb is an adverbial of time in the general past tense.
3. Basic structure: was/were+doing
4. Negative form: was/were+not+doing.
5. General question: put was or were at the beginning of the sentence.
6. At that time, she worked in a PLA unit.
I was reading a newspaper when he came in.
Verb (abbreviation for verb) in the present perfect tense:
1. Concept: the influence or result of an action that happened or has been completed in the past on the present, or the action or state that started from the past and continues to the present.
2. Adverbials of time: recently, recently, since ..., for ... the past few years, etc.
3. Basic structure: have/has+done
Negative form: Yes/Yes+No+D.
5. general question: yes or no.
6. I wrote an article
It has been raining these days.
Six, the past perfect tense:
1. Concept: based on a certain time in the past, actions or behaviors that occurred before or completed before a certain action in the past, that is, "past past".
2. adverbial of time: before, until the end of last year ($ TERM, month ...), and so on.
3. Basic structure: had+done.
4. Negative form: had+not+done.
5. general question: had is placed at the beginning of the sentence.
As soon as we got to the station, the train had already left.
By the end of last month. We have reviewed four books.
Seven, the general future tense:
1. Concept: indicates the action to be taken or the state of being and the intention, plan or preparation for doing something.
2. adverbial of time: tomorrow, the next day (week, month, year …), soon, in a few minutes, from …, the day after tomorrow, etc.
3. basic structure: am/is/are/going to+do; Will/will+do.
4. Negative form: was/were+not; Add did before the action verb and restore the action verb at the same time.
5. General interrogative sentence: put it at the beginning of the sentence; Will/shall mentioned the beginning of the sentence.
6. They will compete with us in study.
It will rain.
Eight, the past future tense:
1. Concept: looking at the future from the past based on a certain moment in the past, often used as an object clause.
2. Adverbial of time: the next day (morning, year …), the next month (week …), etc.
3. Basic structure: was/were/going to+do; Will/should+do it.
4. Negative form: was/were/not+going to+do; Will/should+will not+do it.
5. General interrogative sentence: was or are put at the beginning of the sentence; Will/should mention the beginning of the sentence.
He said that he would go to Beijing the next day.
I asked who was going there.
Mutual transformation of several common tenses
Several tenses in English can be transformed into each other in some cases. The following are several common forms of conversion:
First, the conversion between the past tense and the present perfect tense.
In the present perfect tense, progressive verbs can be used with adverbials indicating a period of time, but instantaneous verbs can't. But other expressions can also be used: ① the sentence pattern of "a period of time+before" in the general past tense uses instantaneous verbs; ② Instantaneous verbs can be converted into corresponding continuous verbs and phrases to be used for a period of time; ③ Instantaneous verbs are used in the sentence pattern of "It is+a period time+since+simple past tense", which means "it's been a while since+simple past tense". Please see:
A.he joined the league two years ago.
B.he has been in the league for two years.
C. he has been in the league for two years.
D. Two years have passed since he joined the League.
Second, the conversion between the simple present tense and the present continuous tense.
In the simple present tense, at with a noun means "in a certain state", such as at work, at school, etc. This phrase can be converted into tense. Please see:
Peter is working, but Mike is playing.
Peter is working, but Mike is playing.
Third, the conversion between the present continuous tense and the general future tense.
In the present continuous tense, verbs such as go go, come, leave, start and arrive are often used with adverbials indicating future time to indicate actions that will happen. I'm coming, mom! I'm coming, mom! Please see:
The train will leave soon.
The train will leave soon.
Fourthly, the transformation of the structure of "be going verb prototype" and "will(shall)+ verb prototype"
"be going verb prototype", indicating intention to do something; The structure of "will(shall)+ verb prototype" in the future tense In written language, when the subject is the first person, the auxiliary verb shall is often used. In spoken English, everyone can use will. Please see:
We are going to visit the Great Wall next Sunday.
We will visit the Great Wall next Sunday.