1. Go straight to First Street.

1-1. Go straight to the First Street.

(Do we have to use 'the' or not?)

2. It's just next to the hospital.
2-1. It's only next to the hospital.
(Are both the same expressions?)

3. I'll go to the railroad station.
3-1. I'll go to the reailway station.
(Are both the same? Which expression do you use frequently?)

4. Choose the correct map which shows where Mike wants to go. (Is this expression correct?)

5. Can you tell me where you live in English?

5-1. Can you tell me the location where you live in English?

5-2. Can you show me where you live in English?

(Are the sentences all grammatical?)

6. The post office is across from the library.
(In this sentence what is the part of speech of 'across', and what is the meaning of 'across'?

7. I appreciate your help.
7-1. I appreciate you.
7-2. Thank you for your help.

(7-1 is worng, isn't it? What is the difference between 7 and 7-2? Which one is the more polite?)

#1 -- You would use "the" only if you're referring to a street in general, the first one near where you are standing or sitting. You would use the first of the two sentences if the formal name of the street is First Street.

#2 -- These two are not alike. I wouldn't use the second one. The first one is fine.

#3 -- The first one is the more commonly used. The second is less commonly used and has a misspelling.

#4 -- It's fine.

#5 -- I'd use either 5 or 5-2, but I'd move "in English" closer to the verb so it makes better sense:
Can you tell me in English where you live?

#6 -- I take "across from" as a preposition. The phrase "across from the library" is adverbial since it tells where something is.

#7 -- All are correct and polite, but have slightly different meanings. The first and third ones are used most often.

1. The use of "the" in these sentences depends on the context. If you are referring to a specific First Street, such as the well-known street in a particular town, then you would use "the" before the street name. For example, "Go straight to the First Street in New York." However, if you are referring to any generic first street, then you can omit "the" and say, "Go straight to First Street."

2. Both expressions convey a similar meaning, but there is a slight difference in nuance. "Just next to the hospital" implies that the location is very close to the hospital, possibly touching or adjacent to it. On the other hand, "only next to the hospital" suggests that it is the only location beside the hospital, without emphasizing the proximity as much.

3. "Railroad station" and "railway station" are essentially the same and can be used interchangeably. However, the term "railway station" is more commonly used in British English, while "railroad station" is more common in American English.

4. The expression "Choose the correct map which shows where Mike wants to go" is grammatically correct. However, if you want to make the sentence sound more natural, you could say, "Choose the map that indicates the destination Mike wants to go to."

5. All three sentences are grammatically correct and convey similar meaning. However, 5-1 and 5-2 have slight differences in tone. "Can you tell me the location where you live in English?" sounds more formal and specific. "Can you show me where you live in English?" is a bit less formal and suggests a visual representation or a demonstration of the location.

6. In the sentence "The post office is across from the library," "across" is a preposition. It indicates the position or location of the post office in relation to the library. In this context, "across" means that the post office is directly opposite or on the other side of the library.

7. You are correct. "I appreciate you" (7-1) is not grammatically correct. The correct expression is "I appreciate your help" (7). Additionally, "Thank you for your help" (7-2) is a more universally recognized and commonly used phrase to express gratitude. It is generally considered more polite and formal than saying "I appreciate your help."