English for Today by Ganiu Abisoye Bamgbose (Dr GAB)
PARTICLES
I will be there to ~pick you~ at 12 noon (nonstandard).
I will be there to *pick you up* at 12 noon (standard).
When you pick up someone or something that is waiting to be collected, you go to the place where they are and take them away, often in a car.
The demand for the commodity shows no signs of ~dropping~ soon (nonstandard).
The demand for the commodity shows no signs of *dropping off* soon (standard).
If the amount, number, or quality of something drops off, it becomes less.
You should ~reply~ letters promptly as an administrator (nonstandard).
You should *reply to* letters promptly as an administrator (standard).
GAB
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