Like/as/as if – English editing.

Like is used as a preposition to show similarity between things:
Was it that he looked so much like his father?
In informal speech and writing it is also used as a preposition in sentences such as :
He looks like he’s never seen an iron.
Purists frown on this use of like and consider it ‘uneducated’ even though this usage dates back at least as far as Shakespeare. (Darwin, for example, wrote, ‘Unfortunately few have observed like you have done’.) If you wish to avoid this kind of criticism, in formal writing and speech use as or as if:
He looks as if he’s never seen an iron.
Unfortunately few have observed as you have done.
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