"In terms of grammar, English is possibly one of the least logical and most puzzling languages there is. This is the result of its hybrid origins. Modern English is basically a mixture of a Teutonic language (Old English) and a Romance language (Norman French). These come from entirely different sub-groups of Indo-European. To be sure, this fusion even happened almost a thousand years ago, but we’ve never gotten over it."
Henry Gee (Senior editor at Nature), as a reply to a question at the "Ask the Nature Editor" forum.