ERIC indexes education related documents and articles produced worldwide. Using the language field allows you to exclude any articles or digests not written in English. Below is an example using the free version of ERIC of how such a search might be constructed.
Since most ERIC articles and digests are in English, limiting a search in this way won't make a huge difference in the number of results obtained. Where this kind of search really matters is if you want articles written in, say, French.