Then, of course, the syntax of German and Dutch is in a category of its own, with verbs coming at the end of sentences under certain circumstances. Many languages do not use articles. Virtually all Western European languages use articles. Hebrew and Arabic have definite articles, but not indefinite articles. Another difficulty for non-native English speakers is the fact that English is not a phonetic language.
Some English vocabulary is peculiar.
It seems that English has more irregular verbs than other languages with which I am familiar. American English especially has a tendency to convert nouns to verbs. This is problematic for speakers of other languages who cannot as easily convert nouns to verbs. In English, they are separate. Much humor has been made of Japanese renderings of the English language.