The purpose of a sentence is to express a complete thought.
To be a complete thought, a sentence must contain a subject and a verb.
(A verb is an action word, aka predicate.)
One period at the end of a sentence is quite sufficient, even if the period serves two purposes (or perhaps even more). Two periods would be awkward.
Could you rewrite your question as a full sentence, please? It's not clear what you are asking.
It is 'you are always' and not 'you always' in a sentence for the purposes of correct grammar.
energy and structure
You need to insert your EMail address for security/validation purposes
Two purposes of a World's Fair are to celebrate great achievements and to address important challenges facing humanity.
These are two pencils is a correct sentence. it has a subject (pencils) a describer (two) and some sentence support (these are)
Reconnaissance
The two nouns, 'nouns' and 'sentence' are placed correctly in your sentence.
"While some inhalants are used for medical purposes, others are abused"
The adjective in the sentence is "two," which describes the number of cows.
What are the two easyest charateristic of a complex sentence