which of the following sentence correct, "It's me"?
Note: Without knowing which sentence precedes this answer, it is not really possible to say if it is accurate. I'll assume it was a question: "Who?"
Technically, no. It has to be “I am.” However, no one has ever answered this question technically; they answered me casually, saying, “I am he.” With a connecting verb such as “by,” the title and purpose of the sentence must change, and the sentence must still be grammatically correct. In that case, it could mean that the sentence should be pronounced “I am,” or at least “I am,” but as it seems impossible. "I am" may be, however, indicating that the pronoun "I" is the one to be used, not "I."
There is a situation, however, where "I" can be right, but it is rare. If the judge at the end of the race wants to present the prize to the winner, but does not know who it is, he or she may ask, "Who will give the prize to?" At that point the winner can identify himself or herself as "I [give him / her the prize]."
If it sounds like "I" is too full of unusual usage, then the speaker name should be used instead of "I". Examples: “Joe.” or "It's Joe."
First, it should be "65 years" (plural) Age - not "65 years" (singular).
After performing that adjustment, we see the difference between "am" and "become."
"When I am 65 years old" refers to a period of one year, from my 65th birthday to my 66st birthday.
"When I am 65 years old" refers to the time when I was 65 years old, which means, on a broad day, my 65 th birthday.
So, "am" and "be" are both correct, but they mean different things.
"If I am 65 years old, I will have a long beard" means I will have a long beard for at least one year between my 65 s and 66s births.
"When I'm 65, I will have a long beard" means I will have a long beard on my 65th birthday, but it does not say anything about my beard the next day after my 65 years and older.
In English, we would have no reason to say: "When I am 65 years old, I will have a long beard." Such a statement is not something that a traditional English speaker might think should be made. Often we do not find it necessary to predict a specific birthday.