Never.
Same as any other use. Use an apostrophe S to indicate possession.
Always start the beginning of a sentence with a capital letter.
No, not unless it was beginning the sentence. Capitalize, by the way.
the letter is R
Yes, in the English alphabet, the letter "s" comes before the letter "t." The order of the alphabet places "s" as the 19th letter and "t" as the 20th letter.
you use the code "<S> write the sentence here </s>"
Yes.
The Scientist`s Curriculum Is To That
you put an s, you put an s at the end
It was the mid 1930's before the all-metal monoplanebecame the accepted norm.This is just one sentence with the word MONOPLANE!I have only flown one monoplane, so far.
for the word summer you use its capital s if in a title or start of sentence
You use a. Use an only with words that start with a vowel sound.A word that starts with s cannot start with a vowel sound, unless the s is actually pronounced like the name of the letter, which is not common. For example, you would say an S-hook, because that would be pronounced an ess-hook. However, for "normal" words that start with s, the article a is correct, as in a serious problem or a sock.