What's the difference between Korean grammar and speculation?

In any case, the most common expression is speculation.

：

? .

It seemed to rain last night.

? ? .

Sung-hee seems to be getting married next year.

2.——(? )? /

According to the situation and appearance, guess what has happened or will happen.

：

? .

It seems to be snowing outside today.

3.——(? )? / ?

Generally speaking, it is to perceive and speculate on the events and States in the previous discourse.

：

.

It seems that I am studying hard for the exam.

? ? .

This week seems like a trip.

4.——?

A situation in which the speaker and the listener can guess at the same time (the speaker is the third person)

：

() ? ? .

(Weather forecast) It will be cloudy tomorrow and rainy in the afternoon.

? .

Studying so hard, you would have entered the university.

5.——? /? / /

Guess what should have happened in the past.

：

? .

I wonder if I went home last night.

? .

I wonder if the students enjoyed their trip.

6.——(? )?

This means that the speaker is convinced that "such a thing will never happen"

：

? .

That man can't be here.

? .

Teachers can't say such things.

7.——(? )? /? ?

It means that the former is the basis for speculating the latter.

：

? .

Seeing that he is so quiet, he should be asleep.

? .

Look how beautiful she is. She is in love, too.

8.—— ?

It means impossible.

：

? .

Judging from the weather, it is impossible to travel tomorrow.

? ? .

Seeing that he studies so hard, he can't go to college.

9.——(? ) /(? ) ?

The first part is the speculative result of a certain fact or situation, and the second part is the content of expressing concern about this result or formulating relevant countermeasures.

：

.

Worried about the rain, I took an umbrella.

? ? .

The crowd was afraid of falling and walked carefully.