1, simple present tense, is an English grammatical form. The action or state that expresses the usual, regular and habitual truth (that is, facts), or the time state of events in which actions occur regularly.
2. The general past future tense indicates the action or state to be taken in the future from a certain time in the past. In English tense, "time" refers to the time when the action takes place, and "state" refers to the appearance and state of the action.
3. The present continuous tense, a technical term, is the tense in English, indicating the current action or state of existence. In English tense, "time" refers to the time when the action takes place, and "state" refers to the appearance and state of the action.
4. The past continuous tense indicates an action or state that is happening or going on in a certain period or time. In English tense, "time" refers to the time when the action takes place, and "state" refers to the appearance and state of the action.
5. It consists of "have/has+ past participle", which has two main meanings: it means that the action happened in the past, but it is related to the present situation, sometimes there is no adverbial of time, and sometimes it is used with some adverbial of past time that expresses uncertainty, such as: many times, just now, however, once, always, before, so far, so far, and so on.
6. Past perfect tense: refers to an action that has occurred or been completed before a certain time or action in the past, which has had some influence or result on a certain point in the past. It is used to refer to an event that has been completed before another past action.
7. The general future tense indicates the action or state in a certain period of time in the future, or the frequent action or state in a certain period of time in the future. In English tense, "time" refers to the time when the action takes place, and "state" refers to the appearance and state of the action.
8. The past future tense refers to the action or state that will happen in the future from a certain moment in the past. Generally, the starting point of the past future tense is the past, that is, the action or state that will happen in the future from a certain moment in the past.