Can I use drop to say I will leave something somewhere?
- I will drop the books at your house.
- I will drop off the books at your house?
You can use either form, but to my (native American English) ear, the second form would normally be written "I will drop the books off at your house." Both are equally good and common. If, however, the object of the verb were a pronoun (e.g., "I will drop them"), then you would be somewhat more likely to use the form with the adverb (e.g., "I will drop them off at your house."), although "I will drop them at your house" could also be used, if somewhat more informally.