为了 as a preposition

Structure:

为了 + [ some purpose ], Subject + Predicate

Meaning:

When 为了 indicates the purpose of an action, it’s usually acting as a preposition. In this role, the whole “为了 phrase” should come before the verb.

Examples:

    为了 钱 ， 他 出卖 了 朋友 。

    Wèi le qián, tā chū mài le pénɡ you

    (money is the purpose) He betrayed his friends for money.

为了 as a verb

Structure:

Subject + ( 是 ) + 为了 + Objective

Meaning:

Occasionally you will see 为了 acting as a verb by itself. In this case, it usually combines with 是, and the meaning is not hard to derive: “to be for.”

Examples:

    我这么做 是 为了 你 。

    Wǒ zhè me zuò shì wèi le nǐ

    Did is for you.