e.g. Nice to meet you, Mike.

1. Stress Nice. Nice is a content word, so nice is stressed.
2. Put the stress on meet.
3. Stress Mike.
4. Mark accent on the first e in 'meet'
5. Put the stress on the first e in 'meet'.
6. Mike is a proper noun, so you should stress Mike. Mark accent on 'i'.
7. Mark accent for the stressed word.
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Are all the expressions grammatical? Would you correct the errors?

I would shorten this and make it more concise.

#1 Stress content words: Nice, meet and Mike.

#2. Mark the content words with an accent mark.

#3. All the content word are one syllable.

#4. The middle vowel in the content words is pronounced with long vowel sounds: "ee" and "eye"

All the expressions seem to be grammatical, but there are a few suggested corrections:

1. "Nice to meet you, Mike." - This expression is grammatical and correct as is.
2. "Put the stress on meet." - This expression is grammatical and correct as is.
3. "Stress Mike." - This expression is grammatical and correct as is.
4. "Mark accent on the first e in 'meet'." - This expression is grammatical, but it would be more clear to say "Place an accent mark on the first e in 'meet'."
5. "Put the stress on the first e in 'meet'." - This expression is grammatical and correct as is.
6. "Mike is a proper noun, so you should stress Mike. Mark accent on 'i'." - This expression is grammatical, but it would be more clear to say "Since 'Mike' is a proper noun, stress the word 'Mike'. Place an accent mark on the 'i'."
7. "Mark accent for the stressed word." - This expression is grammatical and correct as is.

Although the expressions you provided are understandable, they do contain some errors and don't align with standard English grammar rules. Here are the corrections:

1. Stress "Nice." - This is grammatically correct.
2. Place stress on "meet." - This is grammatically correct.
3. Stress "Mike." - This is grammatically correct.
4. Mark accent on the first "e" in 'meet'. - This is not a common practice in standard English. Instead, you can say, "Place emphasis on the first 'e' in 'meet'."
5. Put the stress on the first "e" in 'meet'. - This is grammatically correct.
6. Since "Mike" is a proper noun, there is no need to mark an accent on any specific letter. However, you can say, "Stress the syllable 'Mike'." or "Place emphasis on the name 'Mike'."
7. Mark the accent for the stressed word. - This is grammatically correct, though it is a repetition of the instruction given in point 6.

In conclusion, to make the expressions grammatically correct, you should make the corrections mentioned above.