英語のスキルが伸び悩むの英語

to improve in one's English

to improve oneself in English

attain proficiency in spoken English

I want to increase my English skill.

polish up one's English

to master English

How are you getting along with your English?

I expect to improve my English skill.

I struggled hard―strove hard―to master English.

You are well grounded in English, so you will soon speak it well.

You must practise English constantly, or you get out of practice.

Master English

I study English.

I have to improve my English ability.

I will continue to concentrate on improving my English.

I begin to understand English better.

How are you getting along with your English study?

study English

to practise English

How should I improve my English?

Try to improve your English.

English becomes more and more interesting to me

get proficiency in German

How can I improve my English?

to learn English without attention to pronunciation or grammar

to learn English―study English

What should I do so that I can improve my English?

to learn English

improve one's English through constant practice

have qualifications for teaching English