The sentence "Since I started reading books in English, I'm improving my English" is grammatically correct, but it could be improved by using the Present Perfect Continuous tense as you suggested. The Present Perfect Continuous tense describes an action that started in the past and is still ongoing in the present. Here's an example of how you could rephrase the sentence using this tense: "Since I have been reading books in English, my English has been improving." This sentence emphasizes that the action of reading books in English started in the past and is still ongoing, and that the result of this action is an improvement in English proficiency.

Hi Enrico, "I started reading" is a past simple tense. "I started my beer and after a long sip I felt a bit tipsy." You can also say "I started drinking my beer and after a long sip I felt a bit tipsy." The ing-verb "reading" is making you confused. Think that an ing-verb can be like a noun. Especially when talking about hobbies: reading, playing instruments, etc. Cheers!

This two clause containing sentence. 1. Past 2.present continue In this sentence our continue work is related with our past.