If you already know , start with a basic 1000-word list first. If you know over 6,000 words , this list may be too easy — look for academic or technical word lists.
The materials emphasize "word partners"—common phrases and sentence patterns that words appear in. 4500 Key English Words Pdf
Not all PDFs are created equal. A high-quality 4500 Key English Words document should be structured by (most common first) and theme . If you already know , start with a