Student or Learner
i would like to learn grammatical construction
Welcome to the forums.
We cannot replace English classes or English textbooks.
When you have a SPECIFIC question about English, please ask.
One thing to learn is that the pronoun I is always capitalized, and so is the first letter of a sentence. That makes two reasons that your "i" should be "I" in your sentence.
Also, sentences need some sort of end punctuation.
I would like to learn how to write grammatically.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.