If you are just putting "Welcome", you wouldn't use an apostrophe or an "s". If you are putting something like "Welcome guests", then no apostrophe is needed. Apostrophes aren't used to make words plural.
Yes you do add an apostrophe.
For singular nouns, you add an apostrophe and then another 's (e.g., "Jess's book"). For plural nouns that already end in 's', you just add an apostrophe (e.g., "the teachers' lounge").
Possessives are formed by adding an apostrophe and the letter 's to the noun (e.g., the dog's ball). However, if the noun is plural and already ends in s, you just add an apostrophe (e.g., the dogs' ball). In the case of singular nouns ending in s, you can choose to add 's or just an apostrophe (e.g., James's car or James' car).
To show something is possessed by one owner, add an apostrophe and the letter 's' to the owner. e.g. the cat's milk. (the milk belongs to the cat) To show possession of plural owners you usually only need to add an apostrophe as most plurals already end in 's'. If the plural doesn't end in 's' then add the apostrophe followed by the 's'.
Just add an s. Apostrophes do not make words plural, just possessive.
To show possession using an apostrophe, add an apostrophe and an "s" ('s) after the noun. For example, "Sarah's book" signifies that the book belongs to Sarah. If the noun is already plural and ends in "s," you can just add an apostrophe after the "s," like in "the teachers' lounge."
Yes, when forming the possessive of a singular name that ends in 's', you can choose to either add an apostrophe followed by 's' ('Charles's car') or just an apostrophe alone ('Charles' car'). Both forms are considered correct, but make sure to be consistent in your usage.
Yes, when creating the possessive form of a singular noun that ends in "s," you can either add an apostrophe followed by another "s" (S's) or just an apostrophe (S'). Both forms are considered correct.
This is an ambiguous point of grammar. Some people will add an apostrophe and another s, while others just use an apostrophe without another s. Personally I don't add another s. The pronunciation becomes too awkward.
A possessive noun is formed by adding an apostrophe -s to the end of a word, or just the apostrophe to the end of some nouns that already end with -s; for example:Julie's bedChase's ballthe cat's whiskersthe boss's deskthe pants' pocketsthe glass's crackthe glasses' framethe boys' bikes
To make a word plural, typically just add an "s" at the end. Use an apostrophe only when indicating possession or in contractions, not for pluralization. For example, "dogs" is the plural of "dog," and "dog's" shows possession.
NO when adding an apostrophe you only use it if you're implying that its something they ownEX 1That was Aj's phone!EX 2That phone was Aj's!The Wrong WAYThat phone was Ajs!