Beginner Level Advanced Level
INTERMEDIATE LEVEL
Content
→ → →
OXF3000N 
nhiễm tiêm nhiễm đầu độc lan truyền 
infect
OXF3000N bị nhiễm bị đầu độc infected
OXF3000N sự nhiễm sự đầu độc infection
like: đầu độc → →
I began (= started reading) this novel last month and I still haven't finished it. ☊ begin ☊
Someone had been poisoning his food. ☊ poison ☊
I only started (= began to read) this book yesterday. ☊ start ☊