1. The pizza is too hot for me to eat it.

2. The pizza is too hot for me to eat.

3. The pizza is so hot that I cannot eat it.

4. The pizza is so hot that I cannot eat.
( I think #2 and #3 are correct. Would you let me know why?)

5. Because I am tall, I can touch the ceiling.

6. I am tall enough to touch the ceiling.

7. I am so tall that I can touch the
ceiling.

(Are the three the same? Do you have some more similar expressions?)

#'s 1,2,and 3 are all correct.

#4 is not correct because the pizza is hot you can not eat anything.

5, 6 and 7 are all the same.

1. The sentence "The pizza is too hot for me to eat it" is grammatically correct, but it sounds slightly redundant. The phrase "for me to eat it" is unnecessary since it is already implied in the word "hot" that you are referring to eating the pizza.

2. The sentence "The pizza is too hot for me to eat" is grammatically correct and commonly used. In this sentence, "too hot" implies that the level of heat surpasses what is comfortable or tolerable for you, preventing you from eating the pizza.

3. The sentence "The pizza is so hot that I cannot eat it" is also grammatically correct and conveys the same meaning as sentence #2. In this sentence, "so hot" indicates that the heat of the pizza is at a level that makes it impossible for you to eat it.

4. The sentence "The pizza is so hot that I cannot eat" is grammatically correct, but it sounds slightly unfinished. It is missing an object after the verb "eat." Adding an object, such as "it," would make it complete.

Regarding the second set of sentences:

5. The sentence "Because I am tall, I can touch the ceiling" is grammatically correct. It uses the conjunction "because" to connect the fact of being tall to the ability to touch the ceiling. This sentence suggests a cause-and-effect relationship between your height and your ability to touch the ceiling.

6. The sentence "I am tall enough to touch the ceiling" is also grammatically correct and conveys the same meaning as sentence #5. In this sentence, "tall enough" means that your height is sufficient to reach or make contact with the ceiling.

7. The sentence "I am so tall that I can touch the ceiling" is also grammatically correct and means the same as sentences #5 and #6. The phrase "so tall that" implies that your height exceeds a certain threshold, enabling you to reach the ceiling.

Some other similar expressions could include:

- "I am of such height that I can touch the ceiling."
- "My height is sufficient for me to touch the ceiling."
- "As a result of my height, I am able to touch the ceiling."
- "My height allows me to touch the ceiling."