Is it easier to learn L2 that is similar to L1?

References:
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Ellis, R. (1994). The study of second language acquisition. China: Oxford University Press.
Fries, C. C. (1945). Teaching and learning English as a foreign language. Ann Arbor: University of Michigan Press.
James, C. (1980). Contrastive Analysis. London: Longman.
Krashen, S. (1982). Theory versus practice in language training. In R. W. Blair (Ed.), Innovative approaches to language teaching (pp. 15-24). Rowley, MA: Newbury House Publishers.
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Stockwell, R. & Bowin, J. (1965). The Sounds of English and Spanish. Chicago: University of
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Spanish. Chicago: University of Chicago Press.


Appendix:
Interview questions:
R: How long have you been learning English?
P: I started when I studied at school. Em… I was in the 7^th class
R: Why have you chosen English, not another language?
P: Because English is international language. I can use it everywhere.
R: What was the purpose of learning this language?
P: First when I started learning it I did not have specific aim, but now I need it for my study and work.
R: Can you describe the lessons you used to have?
P: Oh yes. They were typical lessons. Our teacher explained the grammar and we wrote the rules in our notebooks. Then we made sentences and translated mini texts.
R: Did you like the method of teaching?
P: In the past it was ok for us because all teachers taught this way.
R: Are you still having English courses?
P: Yes, I am learning English now too. I have online lessons with my teacher.
R: What was difficult for you in learning English?
P: It was difficult to understand the grammar: to be and articles but I learned it after some time because I repeated many times and made up sentences.
R: Do you have any problems now?
P: Yes, I cannot make up sentences in Indirect Speech. It is difficult to follow grammar rules.