Infinity is perpetual.
flowers are not perpetual.
The Newton's cradle swings in perpetual motion.
Flowers are not perpetual.
To be bereaved is to live a perpetual life
Use "which" to introduce non-essential clauses that provide additional information and can be omitted without changing the meaning of the sentence. Use "that" to introduce essential clauses that are necessary to the meaning of the sentence and cannot be omitted.
You should use a comma in a complex sentence when separating independent clauses connected by coordinating conjunctions (e.g., and, but, or, so). Commas can also be used to set off nonessential clauses or phrases within the sentence.
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at least two clauses; one clause
Yes, nonrestrictive clauses use commas. These clauses provide additional information that can be omitted without changing the overall meaning of the sentence. For example, in the sentence "My brother, who lives in New York, is visiting," the clause "who lives in New York" is nonrestrictive and is set off by commas.
Try to use several clauses in your sentence and use a wide range of advanced vocabulary. Doing this will increase the intelligence people will see you with when reading the sentence. Use the its to join several clauses together and add in the vocabulary to enhance your ability to build complex sentences.
I wouldn't use a semicolon in a conditional (if) sentence. Semicolons can join two independent clauses without a conjunction. The "if" clause in a conditional sentence is dependent, not independent.
Semicolons [;] are used to connect two closely related independent clauses.