Note: A commenter who seems to know something says much of this is wrong - so read it with suspicion.
Ever wonder where those strong verbs in the Germanic languages come from? (Ed: No, they didn't. Very few people concern themselves with such things.) Come, came; give, gave; run, ran; ride, rode; write, wrote. These are basic words, not extra, dressy things we add in for show. They aren't Latinate. They aren't particularly Indo-European at all, actually. Those languages tend more to the use of suffixes for tenses. Vowel changes are more common in Semitic languages such as Hebrew or Arabic, which start with three-consonant root words that are modified to make plurals, tenses, and compounds. Which is why the Hebrew text in your Bible doesn't have vowels, so people had to guess at them and come up with things like "Jehovah" for YHWH - which is a pretty inaccurate guess, BTW.
But how, exactly, did Semitic languages influence Germanic at some point? It's quite a distance, and it is the type of influence that only comes from significant rather than incidental contact. You might acquire some vocabulary from foreign traders, but you only change your verbs for close friends. Linguists spun theories, including a posited "Atlantic" language spoken by somebody Semitic around the North Sea in sometime BCE.\
Linguist Theo Vennemann, who is never short on theories, suggests that it was Carthaginian traders speaking Punic who created this vowel-changing influence. Other Vennemann theories on such diverse topics as Old World hydronomy and the Runic alphabet are at the link.