"As for me, phrasal verbs, prepositions, and relative clauses are some of the most difficult things to learn. However, I have been learning them for a few days, and they have become much easier for me." Corrections made: Spelling correction: "dificult" to "difficult." Verb tense and agreement: "keeping learning" to "learning." "becomes" to "have become." Prepositions: Changed "to me" to "for me" to improve naturalness and correctness.

In my opinion/I think phrasal verbs, prepositions and relative clauses are some of the most difficult things to learn. However, I have kept on learning them for a few days and they have become much easier for me.