100 points for an English question

You're a student, right? First of all, let me tell you, the third statement is also okay.

There are generally only two forms of expression of the hour:

1.Hours (front) + minutes (last).

What you said above"eight and a half"It's "eight thirty".

However, if the minutes are"a quarter"Or"a half"At such a specific time, it must be used between hours and minutes"and"to connect.

For example: seven and a quarter (=seven fifteen).

If the number of minutes is less than 10 minutes, add one in front of it"o", (or without).

For example: nine (o) six

2.Minutes (front) + hours (last).

Unlike above, it must be used between minutes and hours"past"Or"と (worse)."to connect.

For example: twenty past eleven (meaning twenty minutes after eleven o'clock).

five to eight (meaning: five minutes apart).

It must be used for a specific minute"a quarter"Or"a half"to represent.

When the number of minutes is not more than 30 minutes, it is prescribed"past"When the number of minutes is greater than 30 minutes, it is prescribed"to"In short, this expression must be such that the number of minutes is no more than 30 minutes.

All three expressions are desirable I don't know why your teacher said no, but in my opinion, these are all perfectly normal expressions, the same as eating and sleeping, and if someone asks you why you eat and sleep, do you suspect that this person is alien people...I can't tell you about the relevant sentence patterns, grammar and so on, because I'm not interested in grammar, hehe, in fact, I don't think you need to be so serious, it's the same as when you rub glass, trying to clean it so that you can see the outside world clearly, but in fact, as long as you push open the window, you can see more clearly than the cleanest window, be careful to get into the horns, hehe.

eight thirty

Half past eight are all correct.

To past is mainly used to express time.

Regarding the expression of time, there was once such a thing, which is called"Dirt Dirt Dirt Soil"

Changing to English is two to two two, although this is a bit inconsistent with grammatical conventions in expression, but the key lies in practicality and convenience, so we must learn to remember grammar alive, and must not be bound by a fixed grammatical pattern.

eight thirty

half past eight

eight and a half

All three statements are true, but eight and a half are more written, and eight thirty and half past eight are more colloquial. Generally speaking, the time is within half an hour, and you can read it directly, for example, 7:20, multi-seat senen twenty.

For more than half an hour, use to, for example, 8:40, which is read as twenty to nineExactly half an hour later, there are the three statements mentioned above.

In spoken language (not used in written language) all three expressions should be possible;

But when writing half past eight is more common, eight thirty and.

It's okay to write it like 8:30, but eight thirty is less common, but I think it's pretty good.

half past eight

Generally, PAST is used within half an hour, and to is used for more than half an hour, for example, 8:50 can be ten to nine is nine points and ten.

Hello landlord.

According to the whole sentence, the predicate must be in the present tense, which can be excluded first, (the whole sentence means: Mr. Smith works for a mobile company, and now he is not holding any international conferences, because he is on vacation) (according to the meaning, it can be used in the present continuous tense) Hope!

The first question asks you to prove that the determinant of a diagonal matrix is the product of diagonal elements, as long as it is defined as necessary. Because when doing the permutation, except for the diagonal product, the other terms contain zeros, so the conclusion is proven.

Then ask you what is the determinant of the unit matrix, which is obviously 1, because this is a corollary of the above conclusion, and of course has nothing to do with order n.

The second question asks you to prove that the determinant of that matrix is independent of the parameter Seta, which is all that is done by calculating the determinant.

Since the last column is 0 except for the last element, you only need to calculate the determinant of the sub-formula of 2 times 2 on the top left, which is sin squared + cos squared = 1, which is obviously independent of the arguments.

The third question asks you to prove that if b is a matrix formed by the first line of a multiplied by Limda, and the other elements are invariant, then the determinant of b = the determinant of Lymuda multiplied by a. Obviously, as long as the first line of B is complete, and then the first line of A is complete, and the comparison is found to be only one Lambda, that is, the conclusion is reached.

c.The meaning of this phrase is that the runner falls, but he quickly gets up and continues running. It's clear that a conjunction is needed here.

So d can be excluded because the sentence is missing an element in this way. Or means or; Otherwise, it's obviously not right either. And and is and the meaning, this sentence wants to highlight the meaning that although the runner fell, he still insisted on running, emphasizing that he insisted on running, so it was too bland to use and should be used to turn the table and highlight the persistence.

c but.

Although the runner fell, he quickly got up and continued running.

b and table is often used in sentences.

The runner falls, then immediately gets up and continues running.

b.It means that the runner falls, gets up quickly, and continues to run. and...and...

Because the first voidness is for the past virtuality, and the second voidness is the past past completed virtuality.

Because the standard sentence pattern for the past is that the if clause is in the past perfect tense, and the main clause is in the modal verb (would, could, should) plus the present perfect tense.

It is a fictitious speculation of what has happened in the past, and the present tense is a speculation about the future.