The best universities will, yes. You'll want to be just as good in English as the rest of the students are, at least, written English. Your assignments and lab reports will be expected in English, and while grammar isn't the core lesson to be learned in a lab report, if you're not capable of concisely and effectively writing, it will hurt you. Not to mention you'll be learning from English books which will require a high level of reading comprehension in English.My father got into MIT, and attended (he dropped out late into his 2nd year for a variety of rather dumb reasons).
He told me something along the lines once,
"You're a valedictorian, so is everyone else. You're athletic and the star of every club, so is everyone else. You could solve any problem, so can everyone else. Everything that made you special enough to get you there ceases to feel amazing. Suddenly your a very big fish in a pond full of even bigger fish, crammed tightly enough that you're uncomfortably certain you just might not belong there.
I didn't aim to go to MIT. I aimed to be the best I could be at what I loved [physics]. I didn't chase the requirements, though I certainly was aware of them. No, instead I worked to consistently push myself. Everyday a new and harder concept. I just loved the challenge. "
Generally speaking, if you're building yourself up specifically to attend MIT, you'll be disappointed. Don't focus on that nonsense. If you're passionate about the subject, as you say, you'd study it regardless of the name of the school. Anywhere you got in would be better than none. Keep that in your heart, set it aside for later, and focus on the now.