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Unit 1 How can we become good learners? Grammar Focus- 4c
do sth by doing sth
by: 介词,意为“通过,靠”,此处表示方法、手段,后接名词或代词;接动词时,须用动名词形式。
Who is he?
Why is his English so good?
How do you learn English ?
I learn English…
by working with friends
by studying with a group