Some phrasal verbs can be both Type 3 and Type 4. You can add a new particle so that the verb can then take an object:

　　To let go/ let go of something She loved him, but she knew she had to let go. She loved him, but she knew she had to let go of him.

　　To check out/to check out of somewhere She checked out at 10 oclock. She checked out of the hotel at 10 oclock.

　　Pick at: 1)(挑肥拣瘦地)吃; 2)找碴儿。 1. To slowly eat only a small part of a meal (type 2): She picked at her food for about 20 minutes before asking the waiter to take it away.

　　2. To persistently and/or unnecessarily find fault with something (type 2): I hate my new boss: He constantly picks at my work and often tells me to do it again, even though theres nothing wrong with it.

　　Pick off: 1)摘去;2)一个接一个地瞄准打中。 1. To remove by pulling or plucking off (type 1): My jacket was covered in hundreds of small spots of white paint. I had to wait until it dried and then pick them all off individually -it took ages.

　　2. To single out and shoot (type 1): The gunman was very well hidden and he was able to pick off the enemy soldiers one by one.

　　Pick on: 1)与......为难，欺负;2)挑中，选中。

　　1. To repeatedly tease, bully or behave badly towards somebody (type 2): All the children picked on Tommy because he wore glasses.

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