"非常大量的英語"用英語寫作"an extremely large amount of English"。

can write as a great deal of English 或者 can express in a large amount of English

大量英語，就是 "large amount of English"。

Very large

用英語表達“非常大量的”通常是“a very large amount of”。如果要具體寫出來，可以說英文為“very large quantities of”。