I would not count on all cab drivers speaking English, but no doubt they will know a few words, like, "how much?" and such. You should get by fine.

But there's something to watch for, and that's that you are being metered at the correct day-time rate, not the night-time rate. There is a number on the meter, on the left I think, a single number "1". If it says "2", it means you are being charged double.

It's a good idea before you get in to get an idea of the driver's estimate of the fare--in my limited experience, they will name a number quite often, and then stick to it. Perhaps others have more experience with how common this is.