没有那么多为什么，固定搭配就是固定搭配，知道如何准确地使用就可以了，比如 get rid of 就是一个固定搭配，它在日常应用中出现的频率不低，所以会的人始终都会，不会的人要趁机学习一下。 当 rid 作动词时，过去式和过去分词都是 rid 或 ridded，意为“去掉，去除，摆脱”等意思，常用于短语动词 rid sb/sth of sb/sth 或 rid yourself of sb/sth 中，例如：1. rid sb/sth of sb/sth:Further measures will be taken to rid our streets of crime.将采取进一步的措施来防止街头犯罪。In the city, it is hard to rid a building permanently of pests.在城市里，很难永久清除建筑物中的害虫。2. rid yourself of sb/sth: He wanted to rid himself of the burden of the secret.他想把秘密说出来，让自己得到解脱。但 get rid of 中的 rid 是形容词，意为“得到解脱的，摆脱…的”，因此 get rid of 相当于 be rid of，但后者更正式，它们有共同的意思“摆脱或移除”，相当于 remove，摆脱或移除的可以是抽象的，也可以是具体的，包括人，例如：1. get rid of 后面接物作宾语I can't get rid of this headache.我这头疼老也不好。I used weedkiller to get rid of the weeds in the garden.我用除草机除掉花园里的杂草。2. get rid of 后面接人作宾语，表示遣散或解雇某人，相当于 send away He believed that his manager wanted to get rid of him for personal reasons.他认为经理是出于个人原因想开除他。We got rid of our unwelcome guests by saying we had to go to bed.我们说我们必须上床睡觉，以此来摆脱不受欢迎的客人。3. be rid of:I didn't enjoy grading those papers and I was glad to be rid of them.我不喜欢给那些试卷评分，我很高兴能把它们去掉。She wanted to be rid of her parents and their authority.她想摆脱父母及其权威的束缚。I was glad to be rid of the car when I finally sold it.把车卖掉时，我很庆幸终于脱手了。4. remove:The men came to remove the trash from the backyard.男人们来把后院的垃圾搬走。It got so hot that he removed his tie and jacket.天气太热了，他脱下领带和夹克。
除了“摆脱”的意思，get rid of 还可以意为“丢弃，扔掉”，相当于 discard 或 短语动词 throw away，此时的对象只能是具体的东西，例如： 1. get rid of:We got rid of all the old furniture.我们扔掉了所有的旧家具。Let's get rid of that broken chair.我们把那张破椅子扔了吧。It’s a good feeling to go through your wardrobe and get rid of your unwanted clothes.翻找衣柜并把不用的衣服扔掉是一种很好的感觉。2. discard: He makes toys from things people discard.他用人们丢弃的东西做玩具。He had discarded his jacket because of the heat.因天气炎热他脱掉了夹克。3. throw away:That old chair should be thrown away.那把旧椅子应该扔掉了。I can't believe you threw my mother's card away!我不敢相信你把我母亲的名片扔掉了！旧的不去新的不来，人总是要向前的，要适当地放弃身边不会给你的人生带来价值的人或扔掉不用的累赘物，不然现在的人生就是未来人生的影子。
