as / like
The conjunction that takes a clause vs. the preposition that takes a noun.
Use like before a noun or pronoun: She writes like her father. A common error is to put like before a clause with a verb, as in She writes like her father did. To introduce a clause, use as: She writes as her father did. As is also the word in as a child, as usual, as follows.
Examples
UseHe voted like a veteran member. (like before a noun)
UseHe voted as a veteran member would. (as before a clause)
AvoidHe voted like a veteran member would. (like before a clause)
UseDo as I say. (as before a clause)
Dictionaries now also list like as a conjunction meaning “as.” However, many people still consider this use an error, and they judge the speaker who uses like this way.