Please tell me when to use past present perfect tense, present perfect tense, past continuous tense and simple past tense. What is the difference?

One is have ∕ has+p.p.

The second usage

(1) is used with just to indicate the action or state that has just been completed (just is placed between have∕has and p.p.).

I just had lunch.

He has just finished his homework.

(2) indicates that the action occurred in the past, continues to the present, and may continue into the future. It is often used with since.

(a little time) for (a period of time).

I have been learning English since 2000.

He has lived there for 10 years.

(3) Indicates the influence of past actions on the present.

He lost his key.

Used with superlative, meaning "by far the most ..."

You are the cleverest girl I have ever seen.

It's the first time to use It∕This ... which means "the first time ..."

It is his first time to learn English.

Have you been ... Yes ... (returned)

Have∕has gone ... (not returned)

I have been to Shanghai.

Tom went to Shanghai.

past perfect tense

One constitutes had+P.P

The second usage

(1) This behavior occurred before a certain point in the past, and it continued until that point in the past, and may continue into the future.

I lived here before I knew him.

(2) The action has been completed at some time in the past.

I had finished my homework before you came back.

(3) Action is often used in indirect speech, indicating that something has happened before we used to talk or think.

He told us that he had been to America.

past tense

Is a kind of English grammar, indicating an action or state that happened at a certain time in the past. Verbs in the general past tense are usually expressed in the past tense form of verbs, and the past tense of verbs is changed on the basis of verb prototype. The past tense of verbs can be divided into regular verbs and irregular verbs.

The past expression 1 indicates the action or state that occurred at a certain time in the past; 2. Habitual and regular actions and behaviors in the past; Past abilities and personalities of the subjects. The past tense is a verb form that expresses behavior, action and state under various time conditions. The past tense structure refers to the grammatical formation of verb forms in the past tense. The basic form of past tense structure is 1, subject+verb past tense+others; 2. Negative form ① was/were+not; (2) add not before the action verb and restore the action verb at the same time; General interrogative sentence Did+ subject +do+ others. past tense

Example:

What did you do last weekend? I played football. Have you read? Yes, I saw it.

Usage:

( 1)

The past tense usually contains words, phrases or clauses indicating the action time, such as yesterday, the day before yesterday, last week, two days ago, etc. When the context is clear, the adverbial of time can be omitted. I worked in that factory last year. I worked in that factory last year. I went to Tian Long yesterday. Yesterday we went to Tianlong Mountain.

(2)

Simple past tense: indicates the behavior or state at a certain moment in the past. The predicate verb should use the simple past tense. Time stamp: yesterday (yesterday), last week (last week), last month (last month), last year (last year), two months ago (the day before yesterday), at 1990 (at 1990), in this case. I was born in 1990. I was born in 1990. When did you go to the park? When did you go to the park? I went to the park last week. (I went to the park last week) In the above sentences, the first sentence belongs to the general past tense of the be verb; The second and third sentences belong to the general past tense of the notional verb go.