Talking about Verb Tenses in English

In modern grammar, time and state are treated separately. Time is divided into present, past and future. And the state is more troublesome. If you add active voice and passive voice, there will be more changes. So what we do is: take the be verb as a verb, and the participle behind it as the complement of an adjective.

Simple verbs can clearly explain when this action happened. The adverb of time with it will clearly indicate a time period.

In the following description, we use parentheses to describe the time described in a simple formula. Parentheses can be as small as a point or as large as infinity, as long as they are clearly marked.

This bracket is on the left of now, indicating the past time, so the verb is established and is a simple form of the past time.

The past participle introduced here is regarded as the complement of adjectives, and the suffix of past participle.

-ed is an adjective suffix, which means passive. Be verb is a conjunction verb, which has no meaning, but it needs to determine the tense, so it is used here.

Seeing clients after the be verb can be regarded as a present participle phrase, which can be used as an adjective complement to describe the subject. The present participle indicates continuity. Be doesn't need to translate, but only explains tenses.

"When the doorbell rings" is a very short moment, so the verb here is still simple.

Being and questioned can both be regarded as adjectives. The main meaning of existence is suffix -ing, which means existence. Being questioned means "being questioned" and is used as a supplement to the subject "witness"

If the adverb of time is now, or braces or parentheses centered on now, we should use the simple form of present time.

When broadcasting sports games, a series of simple expressions of present tense will be used, because every sentence is now.

Trump is the current president of the United States. But a few years ago, maybe not. So the simple form is used here.

This is a huge support centered on love. But as long as it is expressed in parentheses, it is simple.

Coke discount is a continuous activity, so the present participle selling is used as a complement to emphasize continuity.

Being exhausted can be seen as a supplement. Being only meaningful with the suffix -ing, which means "Being ...". The past participle suffix -ed in depleted means passive, and the two words together mean "consumed". As the complement of adjectives, describe the subject "ozone layer".

The simple form of future time is to put brackets on the right side of the present.

The future hasn't happened yet, so we should add an auxiliary verb will in front of it, which means "it will".

Sleep here is the complement of adjectives, and the suffix -ing indicates continuity and is used to describe the subject "I".

Razed is a past participle, as a complement of adjectives, describing the subject "house".

In the perfect tense, we use arrows to indicate the time and the deadline of action.

The perfect tense does not specify the time when things happened, but only means "once" and "completed".

The arrow I have seen points to the present, indicating that the deadline is now. I have seen it before this moment.

The deadline is emphasized here, so the perfect form is used to express continuity.

The key point of this sentence is "how long has it been", so it is perfect. Re-decoration should be interpreted passively, that is, "decoration" to describe the theme.

Generally speaking, "I have ...

The past perfect requires a past deadline, that is, the arrow points to a past time, before which "it has passed".

The adverb of time in this sentence is "before penicillin was discovered", that is, before a past time point (penicillin was discovered in 1928), so the perfect form of past time is used.

This sentence takes "decision" as the deadline, so we will use the past perfect tense. The complement "smoke three bags" is an adjective phrase, and ing means persistence and describes the subject.

The verb has not been means "not yet", as opposed to "already". The defeated complement is the past participle, which indicates the passive adjective and describes the subject.

Future time is to move the deadline indicated by the arrow to a certain point in the future.

April next year is the deadline, which means "there will be 20 years until April", so we use the perfect tense. Add will, which means it's not April yet, so this is the perfect form of future time.

The deadline is in the future, so use the future perfect tense.

The ending of -ing in conversation means continuity and is treated as an adjective. "Within two minutes" is the future demarcation point, so there will be three hours (the total length of telephone calls) by then.

Summarized as follows: