Since should not be used for ago.
Size up should not be used for estimate or weigh.
Some should not be used for somewhat as "I feel some better."
Sort of should not be used for rather.
Splendid means shining or brilliant and should not be used as a term of general commendation.
Stand for means "be responsible for." Its recent use as meaning stand, endure, or permit, should be avoided.
Start should not be used for begin, e. g., "He started (began) to speak."
State should not be used for say.
Stop should not be used for stay.
Such should not be used for so. Say "I have never seen so beautiful a book before" not "I have never seen such a beautiful book before."