1. Simple present tense
Usage:
A) indicates the actions, situations, states and features that are happening now.
B) idioms.
C) Regular habitual movements.
D) objective facts and universal truth. Especially if the context is not the general present tense, it is impossible to keep the tense of the main clause and the clause consistent.
E) indicates the action that will happen according to the regulations, plans or arrangements (limited to some verbs that mean "come, go, move, stop, start, end and continue"). ) can be used with adverbials indicating future time. Common usage is: planes, trains, ships, cars and other means of transportation that run at fixed points on a regular basis.
F) In the adverbial clauses of time and conditions, the simple present tense (sometimes the present perfect tense) is often used to indicate future events.
2. What are you doing now?
Usage: the action that is going on now.
3. It has been done now.
Usage:
A) indicates that the action has been completed or just completed.
B) indicates the action or situation that started from a certain time in the past, continued to the present, and may continue. Progressive verbs are often used at this time. Adverbials of time are often used to indicate a certain point in the past, or a period of time, or the present time.
C) indicates an action or situation that happened in the past but still has an impact on the present. Some verbs are usually used, such as: arrive, start, find, give, lose, etc.
4. What I've been doing.
Usage: indicates that an action started at a certain time in the past, continues or appears repeatedly today, or will continue into the future.
We have been working on this project for over a month. Up to now, we have been working on that project for more than a month. )
Note: Compared with the present perfect tense, the present perfect tense emphasizes that the action or state has been continuous or repeated from the past to the present.
5. Simple past tense
Usage:
A) indicates an action or situation that happened at some time in the past.
B) Show past habitual actions. Especially the sentence pattern expressed by would/ used to do itself represents the past tense.
C) Sometimes it can replace the simple present tense to express a smooth, polite, polite and negotiating tone.
6. Past perfect tense
Usage: indicates the action that has occurred or the state that has existed before a certain time or action in the past. It is what we often say: expressing past behavior or state.
7. Past and future tense (will/should be done)
Usage: indicates what will happen from a certain time in the past.
8. Past continuous tense (being done)
Usage:
A) Represents an action that occurred at a specific time in the past.
B) If one of the main sentences guided by adverbials of time such as when and while is the simple past tense, the other sentence is often used in the past continuous tense.
9. Simple future tense
Usage:
A) the basic structure is will/shall do.
B) Some verbs, such as: arrive, approach, come, do, finish, go, have, leave, open, play, return, sleep, start, stay, etc. Used in the simple continuous tense, usually used with adverbial of time indicating future time, indicating future tense.
C) When you say "I'm going to … I want to …", you can use being to do.
D) When it means "soon", you can use be about to do. Emphasize what to do in the near future or immediately.
E) five usages of e)be to do:
A) means "something will happen or do something as planned."
B) What to do or not to do (the tone is close to that of should, must, should and have to) indicates the imperative and persuasive tone.
C) What is possible or impossible (close to possible, possible)
D) It will happen, and it will happen in the future.
E) Used in the conditional sentence "If you want to, imagine" (close to if you want to, or if you should)
F) The sentence pattern that can also mean "about to do something" is about to do something.
10. Future continuous tense (will be done)
Usage: emphasize the action or thing that is happening at a specific time in the future.
1 1. will be completed.
Usage: indicates an action or state that starts from a future time and continues to another future time, or indicates an action or state that occurs in a future time but has an impact on another future time. It's like translating the present perfect tense into the future time period of the timeline. Its usage has changed from being related to the past and present to being related to the future and the future.
12. Future perfect continuous tense: will always be doing, will always be doing.
13. Past perfect continuous tense: I have been doing it.
14. Past and future continuous tense: should do, will do.
15. Past and future perfect tense: what should be done, what will be done.
16. Past and future perfect continuous tense: It should be done all the time, and it will be done all the time.