谁能帮我分析一下这句话的句子结构think of this lettuce as the first link in a

谁能帮我分析一下这句话的句子结构think of this lettuce as the first link in a garden food chain.
开头是大写，就是一句句子：Think of this lettuce as the first link in a garden food chain.单独成句的，怎么看？

这是一个祈使句
Think of 是谓语
this lettuce是宾语
as the first link是宾补
in a garden food chain是定语 修饰the first link .
这是think of sth as sth 句型