Your question is very general. From a linguistic point of view, mastering a foreign language does not depend on how many cases and examples you cite. More importantly, you should start with the analysis of the grammatical structure of the email, learn to break sentences and extract the sentence trunk. In other words, for some long and difficult sentences, don't be confused by some attached leaf modifiers, phrases and clauses in the sentence itself, so that you can't get in or out.

In addition, some formal themes need to be analyzed, such as emphasizing deconstruction; And don't forget some common methods such as inverted sentences and idioms!

If you want to analyze your problem comprehensively, a paper may not be clear, and you can set up a subject. Let me give you an example: it is not clear how the court's ruling (that is, the validity of same-sex marriage must be respected) will be interpreted in States that do not allow same-sex marriage.

In countries or regions where homosexuality is not allowed, it is not clear how to interpret the court's stipulation that the legality of gay marriage must be respected.

Break down into:

It is not clear how the court's ruling will be interpreted (in States where interpretation is not allowed).

The ruling is that the validity of same-sex marriage must be respected.

Learning English is like building a house with bricks or stones. It can't be done overnight. I hope you stick to it and succeed!