Explanation:

- Option 2: will you taught me

- This segment contains a grammatical error. "Will" and "taught" cannot be used together. "Will" is used with the base form of the verb, so it should be "will you teach me."

- Option 1: in English

- This part is grammatically correct. It refers to the language, English, which is fine in context.

- Option 3: how to speak

- This is correct as it suggests learning to communicate verbally, which is contextually appropriate.

- Option 4: By the way

- This is a common expression introducing a related thought or question. It is grammatically sound.