Subject and verb always has to agree. When dangling, watch your participles Do not use a foreign term when there is an adequate English quid pro quo. However, if you must use a foreign term, it is de rigor to spell it correctly. It behooves the writer to avoid archaic expressions. Avoid cliches like the plague.
Mixed metaphors are a pain in the ass and ought to be thrown out the window.
Placing a comma between subject and predicate, is not correct. Parenthetical words however should be enclosed in commas. Consult the dictionary frequently to avoid mispelling. Don't use tautological, repetitive or redundant statements. Don't use tautological, repetitive or redundant statements.