把【bǎ】

把 brings the object in front of the verb. The sentence then says what the subject did to that object and where or how it ended up.

Moving something somewhere

The most frequent 把 sentences move a thing: the verb, then 在, 到 or 给, then where it ends up or who gets it. In these sentences 把 is required.

• × 请放书在桌子上 → 请把书放在桌子上
• × 他停车在门口了 → 他把车停在门口了

Turning it into something

Verb + 成 says what the object became, or was taken to be.

Something has to follow the verb

A 把 sentence can't end on a bare verb. A complement, 了, a place, or a doubled verb goes after it.

• × 我把作业做 → 我把作业做完了
• × 你把门关 → 你把门关上

The object has to be something specific, and the verb has to do something to it; 不, 没 and modal verbs go in front of 把. Each of these has its own point.