What's the difference between the past tense and the past participle? I've already seen it . I saw it on television last year. This is a sentence in a new concept text. Why use the past participle see in the first sentence and the past tense saw in the second sentence? Don't they all mean what happened in the past? Under what circumstances do we use the past tense and the past participle? If you are a beginner of English, please speak more colloquially,

In fact, the tenses of the two sentences you listed are not the same. The first sentence: I've already seen it. It's the present perfect tense. It means that something or an action has happened and has an influence on the present. Its general structure is: subject + have / has + verb past participle + other

Xiao Li put a fresh egg into a cup of water and observed that the egg would sink into the bottom of the cup
(1) If the salt powder is gradually added to the cup until the solution is saturated (the density of saturated salt water is higher than that of egg), what phenomenon will be observed and why
(2) If hydrochloric acid is added drop by drop to the cup, how does the egg move? Write the chemical equation of the reaction in the above process

1) Egg will rise to the liquid level reason: because of the salt added to the water, the density of the liquid increases to greater than that of the egg. From the physical floating and sinking conditions, the egg will rise to the liquid surface and float. 2) the egg will keep rising, falling, rising, falling Reason: the main component of eggshell is carbonic acid

In RLC series circuit, if the inductance L is connected in parallel with a resistor R1, how will the resonant frequency change?

The RLC parallel circuit in Figure 9 can obtain the parallel resonant angular frequency. It can be seen that the parallel resonant frequency is different from the series resonant frequency, and the voltage value jumps from one value to another, which is called step voltage. In the circuit shown in Figure 11, when the switch is closed

In the 30 years of reform and opening up, what major theoretical achievements has our party produced in combination with Marxism? What is the theme (main line)?

On the plural change of English words
Egg carrot leaf tomato tooth mouse watch bus man flower sheep box family child boy photo strawberry knife book story

eggs carrots leaves tomatos teeth mice watches buses men flowers sheep boxes families children boys photos strawberries knives books stories

If a cylinder is cut off 5cm in height, its surface area will be reduced by 31.4cm. What is the original surface area of a cylinder in cubic centimeter

31.4*5=6.28
6.28*3.14*2
=2*2
=1
6.28^20=125.6
3.14 ^ 1 squared
=3.14^1
=3.14
125.6+3.14^2
=125.6+6.28
=131.88

What is the greatest common factor of 15 and 25 The least common multiple is ．

15 = 3 × 5, 25 = 5 × 5, so the greatest common factor of 15 and 25 is 5, and the least common multiple is 5 × 3 × 5 = 75

In the triangle ABC, ab = AC, the center line BD divides the perimeter of the triangle ABC into 12 and 9 parts, and calculates the length of each side of the triangle ABC?

Because BD is the middle line of AC, ad = DC = 1 / 2Ac and ab = AC, so ad = DC = 1 / 2Ab. Suppose AD + AB = 12, that is, 1 / 2Ab + ad = 12, and get ad = 8, that is, AC = AB = 16, because ab-bc = 12-9 = 3, so BC = 13. Solve AD + AB = 9, that is, 1 / 2Ab + ad = 9, and get ad = 6, that is, AC = AB = 12, because ab-bc = 12-9 = 3

The greatest common factor of number a and number B is 12, the least common multiple is 72, number a is 24, and number B is 12______ ．

Because 72 △ 12 = 6, 6 = 1 × 6 = 2 × 3, there are two cases of these two numbers: 12 × 2 = 24, 12 × 3 = 36 (in line with the meaning of the question) or 12 × 1 = 12, 12 × 6 = 72 (not in line with the meaning of the question); that is, the number a is 24, and the number B is 36

Excel 2003 formula correction = or ($B1 = H1, $C1 = H1, $D1 = H1, $E1 = H1, $F1 = H1, $G1 = H1)
=Or ($B1 = H1, $C1 = H1, $D1 = H1, $E1 = H1, $F1 = H1, $G1 = H1) how to modify to make the blank space of the number not filled in not colored? For example, C1 is a space, and h1-r1 has exactly 0, mark 0 as red, and how not to mark the blank space as 0 as red
The conditional formula is placed in H, I, J, K, L. and other multi column cells

Your question is only half said. In which cells are your conditional formatting formulas placed?
Supplement:
Select h, I, J, K, L. column, conditional format, formula:
=COUNTIF($B1:$G1,H1)