Net King's Absolute Shutdown

"Qianye, what is the past perfect tense?" Taocheng looked at the English tense written in the English book, and his face was at a loss.

Uh... I was speechless, then took the English book in his hand, pulled a piece of paper, and started to write on it, because I was afraid that he would not understand after I told him for a long time, and I hate talking the most.

In fact, as long as you understand the basic structure of this tense, you don’t need to memorize so much. I recalled it, and then wrote: It means an action completed at a certain moment in the past or before the action, and it can also be said to be in the past. time with respect to past actions.That is, "past past".It can be expressed by prepositional phrases such as by, before, or a temporal adverbial clause (in a compound sentence, an adverbial clause guided by a temporal conjunction is called a temporal adverbial clause), or it can be expressed by an action expressing the past, and it may also be expressed through the context To represent.

Subject + had + past participle vpp. (done)

1.Affirmative sentence: subject + had + past participle

2.Negative sentence: subject + had + not + past participle

3.General questions: had + subject + past participle?

Affirmative answer: yes, subject + had

Negative answer: no, subject +hadn't

4.Special interrogative sentences: special interrogative words or phrases + general interrogative sentences (had+subject+past participle)?

5.Passive voice: subject + had (hadn't) + been + past participle

"This is the basic structure. If you encounter this type of sentence, you have to use a specific answer to choose the answer." I drew a picture on the paper, and then opened my mouth lightly.

Oh, Taocheng nodded, then took the piece of paper, and went to recite it silently.

"Hiss, Supervisor Qianye, how to solve this system of linear equations in two variables?" Haitang was stumped by a calculation problem.

I tore off a piece of paper again, and then started to do this problem, but it was done in 1 minute, and then I handed it to Haitang, "An equation that contains two unknowns and the degree of the terms of the unknowns is 1 is called quadratic equation."

Then write the approximate steps next to the questions you made:

The general steps to use substitution elimination method are:

【1】Choose an equation with relatively simple coefficients and transform it into the form of y = ax +b or x = ay + b;

[2] Substitute y = ax + b or x = ay + b into another equation to eliminate an unknown number, thus turning another equation into a one-dimensional equation;

【3】Solve this one-variable linear equation to find the value of x or y;

【4】Substitute the calculated x or y value into any equation in the equation system (y = ax + b or x = ay + b) to find another unknown number;

[5] Combine the obtained values ​​of the two unknowns with curly brackets, and this is the solution of the binary linear equation.

The general steps for eliminating elements by addition and subtraction are:

【1】In binary linear equations, if the coefficients of the same unknown are the same (or opposite to each other), they can be directly subtracted (or added) to eliminate an unknown;

【2】In binary linear equations, if the situation in 1 does not exist, you can choose an appropriate number to multiply both sides of the equation, so that the coefficients of one of the unknowns are the same (or opposite to each other), and then multiply the two sides of the equation Subtract (or add) respectively, eliminate an unknown, and obtain a linear equation in one variable;

【3】Solve this linear equation in one variable;

[4] Substitute the solution of the one-variable linear equation into the equation with relatively simple coefficients in the original equation system, and find the value of another unknown number;

[5] Combine the obtained values ​​of the two unknowns with curly brackets, and this is the solution of the system of binary linear equations.

"If you bring these steps into the calculation formula, just choose the one that you think is most suitable." I handed the draft paper to Haitang, and Haitang looked at the words and numbers on it, and nodded immediately. It seems that this piece of paper is only needed. The above things can be memorized to meet the exam.

I sat in front of the computer, wondering why these guys haven't come to ask me questions for a long time, do they understand?That was so good, I looked up, but was completely speechless.

The two guys fell asleep with their heads together, and their saliva was about to flow out.

Alas, I sighed, it seems that there is only one way, I entered the national examination paper center at once, and then transferred the final examination paper, quickly copied the above test questions, and then printed out in the printer.

Looking at so many test papers, I nodded. I should be able to pass the test now. Of course, I didn’t forget to prepare two sets of test papers for myself. The subjects I am not good at are also a challenge for me. Deadly Achilles.

[Note: The education in Japan is different from that in China, they only learn equations in the second year of junior high school]