What language has grammar that is most similar to English?

Answer 1

Old English, sometimes called Anglo-Saxon, is heavily influenced by the German language, and is part of the Germanic group of Indo-European languages.

Old English later morphed into Middle English (think Shakespeare) and then eventually to Modern English, which has various standard dialects based on where it's spoken--in publishing, we frequently "Americanize" the U.K. and Australian texts, which have certain phrases that are not commonly known to American readers.

Modern English has a lot of influences from various languages, because English is a mish-mash language, but many of our root words come from the Latin and Greek languages, and we pick up a lot of words from French and Spanish (both Romance languages which came from Latin), as well.

A great English-language learning tip is to learn the Latin and Greek root words.