1. I have lived there since I was born.

2. I have lived there since 2000.
3. I have lived there since in 2000.
4. I have lived there since I was 8 years old.
5. I have lived there for about 8 years.

(Would you check the sentences? Which ones are not grammatical?)

6. He does love you.
7. He really loves you.
8. Really he loves you.

(Does #6 mean #7? What about #8?
Are the three all the same in meaning?)

They are essentially correct. Put a comma in #8. Really, he loves you. Between 7 and 8, perhaps in 7 the stress is on LOVE while in 8, it's on REALLY. The idea is the same in all 3.

As for #3, the "in" implies "some time in that year."

Sra

Sentences 1, 4, and 5 are grammatically correct. Sentence 2 has a minor grammatical error, and sentence 3 is not grammatical.

In sentence 2, "I have lived there since 2000," is grammatically correct because it uses the correct preposition "since" to indicate the starting point in time.

In sentence 3, "I have lived there since in 2000," is not grammatical because it uses both "since" and "in" together, which is redundant and sounds awkward. The correct sentence would be without the "in," like sentence 2.

Regarding your second set of sentences:

Sentence 6, "He does love you," and sentence 7, "He really loves you," convey a similar meaning. Both sentences express the speaker's belief or assurance about someone's love. The use of "does" in sentence 6 emphasizes the verb "love," which indicates strong affirmation.

However, sentence 8, "Really he loves you," has a slightly different meaning. In this sentence, "really" is used as an adverb to modify the verb "loves." The word order in this sentence is less common and may sound unusual in everyday conversation. A more natural construction would be "He really loves you."

Overall, sentences 6 and 7 convey the same meaning, but sentence 8 has a different word order and may not be used as frequently in conversation.