Thank you very much for your corrections. I still have a few questions on my previous post.

1. I'm as fast as a lightning.
I'm fast like lightning.
I'm fast like a lightning. (?)
I'm lightning fast.
2.The personification is usually made (recognizable?) with the use if the capital letter.
3. Being the wind invisible and not provided with bones or feet, it is useless to offer him a chair just like (?) you can't offer a sofa to the air.
4. The mirror is the symbol of the aging process (or ageing process?).
5. People don't have time to stare at nature's beauty. Therefore, they aren't as happy as the squirrels in the woods hiding their nuts in grass.

1. I'm as fast as a lightning.

I'm fast like lightning.
I'm fast like a lightning.<~~no!
I'm lightning fast.
The others are OK.

2. Personification is usually recognizable with the use if the capital letter.

3. Because the wind is invisible and not provided with bones or feet, it is useless to offer him a chair, just as you can't offer a sofa to the air.

4. The mirror is the symbol of the aging process.

5. People don't have time to stare at nature's beauty. Therefore, they aren't as happy as the squirrels in the woods hiding their nuts in the grass.

1. In terms of the comparison, there are a few correct options:

- "I'm as fast as lightning." Here, you are directly comparing your speed to that of lightning.
- "I'm fast like lightning." This is another way to express the same comparison.
- "I'm lightning fast." This phrase uses "lightning" as an adjective to describe how fast you are. This is a common idiomatic expression.

2. You can make personification recognizable by using a capital letter. For example, when referring to a non-human entity like a river or a tree, you can capitalize the first letter to personify it. This helps to give it human-like qualities or characteristics.

3. The revised sentence could be: "Since the wind is invisible and lacks bones or feet, offering a chair to the wind is pointless, just like offering a sofa to the air." Here, the comparison is made clearer by using "just like" and rephrasing the sentence for better clarity.

4. Both "aging process" and "ageing process" are correct, but the preferred spelling can vary depending on the regional variation of English. In American English, "aging" is commonly used, while in British English, "ageing" is more frequently used. Choose the spelling based on your intended audience or the style guide you are following.

5. The revised sentence could be: "People don't have time to appreciate nature's beauty, and as a result, they miss out on the happiness that squirrels experience while hiding their nuts in the grassy woods." Here, the sentence is restructured to improve clarity and express the comparison between people and squirrels more effectively.